Updated vendored ntp package (#681)

The github.com/beevik/ntp package was recently updated with some
API changes that broke node_exporter. This commit fetches the
latest version of the ntp package and brings node_exporter in
line with the latest API.

collector/ntp.go

@@ -152,7 +152,7 @@ func (c *ntpCollector) Update(ch chan<- prometheus.Metric) error {
 		maxerr += time.Second
 	}
-	if resp.Validate() && resp.RootDistance <= *ntpMaxDistance && resp.CausalityViolation <= maxerr {
+	if resp.Validate() == nil && resp.RootDistance <= *ntpMaxDistance && resp.MinError <= maxerr {
 		ch <- c.sanity.mustNewConstMetric(1)
 	} else {
 		ch <- c.sanity.mustNewConstMetric(0)

vendor/github.com/beevik/ntp/CONTRIBUTORS

@@ -4,3 +4,4 @@ Anton Tolchanov (knyar)
 Christopher Batey (chbatey)
 Meng Zhuo (mengzhuo)
 Leonid Evdokimov (darkk)
+Ask Bjørn Hansen (abh)
\ No newline at end of file

vendor/github.com/beevik/ntp/README.md

@@ -4,21 +4,22 @@
 ntp
 ===
-The ntp package is an implementation of a simple NTP client. It allows you
-to connect to a remote NTP server and request the current time.
-To request the current time, simply do the following:
+The ntp package is an implementation of a Simple NTP (SNTP) client based on
+[RFC5905](https://tools.ietf.org/html/rfc5905). It allows you to connect to
+a remote NTP server and request the current time.
+If all you care about is the current time according to a known remote NTP
+server, simply use the `Time` function:
 ```go
 time, err := ntp.Time("0.beevik-ntp.pool.ntp.org")
 ```
-To request the current time along with additional metadata, use the Query
-function:
+If you want the time as well as additional metadata about the time, use the
+`Query` function instead:
 ```go
 response, err := ntp.Query("0.beevik-ntp.pool.ntp.org")
 ```
-NB: if you want to use the NTP Pool in your software you should request your
-own [vendor zone](http://www.pool.ntp.org/en/vendors.html).  You **must
-absolutely not use the default pool.ntp.org zone names** as the default
-configuration in your application or appliance.
+To use the NTP pool in your application, please request your own
+[vendor zone](http://www.pool.ntp.org/en/vendors.html).  Avoid using 
+the `[number].pool.ntp.org` zone names in your applications.

vendor/github.com/beevik/ntp/RELEASE_NOTES.md

+Release v0.1.1
+==============
+
+**Breaking changes**
+
+* Removed the `MaxStratum` constant.
+
+**Deprecations**
+
+* Officially deprecated the `TimeV` function.
+
+**Internal changes**
+
+* Removed `minDispersion` from the `RootDistance` calculation, since the value
+  was arbitrary.
+* Moved some validation into main code path so that invalid `TransmitTime` and
+  `mode` responses trigger an error even when `Response.Validate` is not
+  called.
+
+
+Release v0.1.0
+==============
+
+This is the initial release of the `ntp` package.  Currently it supports the following features:
+* `Time()` to query the current time according to a remote NTP server.
+* `Query()` to query multiple pieces of time-related information from a remote NTP server.
+* `QueryWithOptions()`, which is like `Query()` but with the ability to override default query options.
+
+Time-related information returned by the `Query` functions includes:
+* `Time`: the time the server transmitted its response, according to the server's clock.
+* `ClockOffset`: the estimated offset of the client's clock relative to the server's clock. You may apply this offset to any local system clock reading once the query is complete.
+* `RTT`: an estimate of the round-trip-time delay between the client and the server.
+* `Precision`: the precision of the server's clock reading.
+* `Stratum`: the "stratum" level of the server, where 1 indicates a server directly connected to a reference clock, and values greater than 1 indicating the number of hops from the reference clock.
+* `ReferenceID`: A unique identifier for the NTP server that was contacted.
+* `ReferenceTime`: The time at which the server last updated its local clock setting.
+* `RootDelay`: The server's round-trip delay to the reference clock.
+* `RootDispersion`: The server's total dispersion to the referenced clock.
+* `RootDistance`: An estimate of the root synchronization distance.
+* `Leap`: The leap second indicator.
+* `MinError`: A lower bound on the clock error between the client and the server.
+* `Poll`: the maximum polling interval between successive messages on the server.
+
+The `Response` structure returned by the `Query` functions also contains a `Response.Validate()` function that returns an error if any of the fields returned by the server are invalid.

vendor/vendor.json

@@ -2,12 +2,6 @@
 	"comment": "",
 	"ignore": "test",
 	"package": [
-		{
-			"checksumSHA1": "0Tugz8gj9KqqVj6JLkXUA7BXas4=",
-			"path": "github.com/sirupsen/logrus",
-			"revision": "0208149b40d863d2c1a2f8fe5753096a9cf2cc8b",
-			"revisionTime": "2017-02-27T12:44:09Z"
-		},
 		{
 			"checksumSHA1": "KmjnydoAbofMieIWm+it5OWERaM=",
 			"path": "github.com/alecthomas/template",
@@ -27,10 +21,12 @@
 			"revisionTime": "2015-10-22T06:55:26Z"
 		},
 		{
-			"checksumSHA1": "X73SC/5YR0afYD/tq802Shxb0UI=",
+			"checksumSHA1": "OXcULIfKv/Xcsa4o1By1lY0s+AI=",
 			"path": "github.com/beevik/ntp",
-			"revision": "74e5133786235ede462c83c17fa3b34653901719",
-			"revisionTime": "2017-08-25T09:16:23Z"
+			"revision": "802074b1b037c59dbdbee7e196ad91b51d0ec844",
+			"revisionTime": "2017-10-03T23:10:51Z",
+			"version": "v0.1.1",
+			"versionExact": "v0.1.1"
 		},
 		{
 			"checksumSHA1": "spyv5/YFBjYyZLZa1U2LBfDR8PM=",
@@ -182,6 +178,12 @@
 			"revision": "a66a2f8b6f3fe82a95a1bed0bb3705bac8031717",
 			"revisionTime": "2017-06-07T19:36:46Z"
 		},
+		{
+			"checksumSHA1": "0Tugz8gj9KqqVj6JLkXUA7BXas4=",
+			"path": "github.com/sirupsen/logrus",
+			"revision": "0208149b40d863d2c1a2f8fe5753096a9cf2cc8b",
+			"revisionTime": "2017-02-27T12:44:09Z"
+		},
 		{
 			"checksumSHA1": "uozMgPjB4AggpuuJkGq3FgAs4CA=",
 			"path": "github.com/soundcloud/go-runit/runit",