Signed-off-by: Milo Casagrande <milo@milo.name>

nodejs cannot be installed due to absence of libhttp_parser.
This fix download libhttp_parser rpm from archives and install it.

When centos 7.4 will be out, this fix will be no longer necessery.

* Run nodejs on centos: Centos install nodejs as node, so this patch add a task for run nodejs
on centos vi is spetial binary name
* Make centos nginx compatible with debian one: this patch creates sites-availlable/sites-enabled on centos for being compatible with the debian FHS
* Handle uwsgi for centos: this commit add support for uwsgi on centos
* uwsgi does not autocreate the full path for socket on CentOS: this patch add the necessary config for autocreate the socket directory path
* Allow nginx to access uwsgi socket for centos: under CentOS, uwsgi ignore uid/gid configs and run as uwsgi. With that, nginx cannot access the socket, so it need to be set to 666.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>

ansible_lsb.id works only if OS support LSB (and have the correspoding
package).
It does not work on CentOS out of the box and it could be the same on
other OS.
Since ansible_distribution is always availlable, its better to use it.

Provide a template secrets.yml file and mention it in the doc

Signed-off-by: Loys Ollivier <lollivier@baylibre.com>

New file INSTALL.md to document Ansible installation process
Update README.md to point to INSTALL.md

Signed-off-by: Loys Ollivier <lollivier@baylibre.com>

* configure-nginx: Do not hardcode nginx username
* nginx: error_log off is not a valid way to disable error log

Update redis-server Ubuntu PPA repository, previous one is error 404.

Signed-off-by: Loys Ollivier <lollivier@baylibre.com>

The install-app role need to create /etc/linaro before placing files inside

 * nginx 1.10 moved to a dynamic module loading approach. That
   directive is needed to load the external modules we rely upon.

  * Created separate repo to store kernelci frontend depoyment
    configuration.