rails_helper.rb's only logic was to require
spec_helper.rb.

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

Updates changed method names and fixes spec failures

Two changes:
1. Move bin/web to bin/web_unicorn(removed PUMA switching logic)
Introduce new shadow script bin/web. Now we have 3 scripts working
together: bin/web, bin/web_puma, bin/web_unicorn

  In bin/web, it checks ENV['USE_WEB_SERVER']:
    - if value is 'puma' or value is not set, call bin/web_puma
    - if value is 'unicorn', call bin/web_unicorn
    - report error if other values given

2. Gitlab rails allow ENV setting to override timeout
    - ENV['GITLAB_RAILS_RACK_TIMEOUT'] for service_timeout
    - ENV['GITLAB_RAILS_WAIT_TIMEOUT'] for wait_timeout

In https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24962 the
stable branches were incorrectly changed to `stable-X-Y`. This commit
fixes this so we correctly use `X-Y-stable`.

This removes the requirement and any mention of targeting security
branches when working on security releases. The release process
documentation changes for these CE changes can be found in merge request
https://gitlab.com/gitlab-org/release/docs/merge_requests/97.

The proposal to remove security branches was approved in
https://gitlab.com/gitlab-org/release/framework/issues/165#note_138139016.

Improve existing issue templates for security releases

Signed-off-by: Rémy Coutable <remy@rymai.me>

This adds additional options that make it easier to use this script:

1. It adds `--dry-run` option that only displays Git commands that are
going to be executed.
2. It adds `--remote` option that makes it possible to override Git
remote name.

* updates Gemfile
* uses Rails 5 unless explicitly disabled

This allows us (and others) to test drive Puma without it affecting all
users. Puma can be enabled by setting the environment variable
"EXPERIMENTAL_PUMA" to a non empty value.

Was introduced in the time that GitLab still used NFS, which is not
required anymore in most cases. By removing this, the API it calls will
return empty responses. This interface has to be removed in the next
major release, expected to be 12.0.

1. Add support for `RAILS5=1|true` for the `bin/spinach` command.
2. Synchronize used spinach versions both for rails4 and rails5.

For rails5 it was accidently used spinach 0.10.1 instead of 0.8.10.
That brought some problems on running spinach tests.

Example of failure message:

NoMethodError: undefined method `line' for #<Spinach::Scenario:0x000000000c86ba80>
Did you mean?  lines
  /builds/gitlab-org/gitlab-ce/features/support/env.rb:52:in `before_scenario_run'

Signed-off-by: Rémy Coutable <remy@rymai.me>