Gitlab initial implementation

[lkysow]

Gitlab Testing Todo

• test pagination for Gitlab modified files api call
• test against Gitlab enterprise
• test merge request approvals (need enterprise)

Files to test

• cmd/server
• server/events/command_handler
• server/events/event_parser
• server/events/vcs/gitlab_client
• server/events/vcs/proxy
• server/events/vcs/not_configured_client
• server/gitlab_request_parser
• server/events_controller

Misc

• add comments to all public methods/fields
• rename GHStatusUpdater to Github..

[codecov-io]

Codecov Report

Merging #190 into master will increase coverage by 2.57%.
The diff coverage is 65.47%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   60.97%   63.54%   +2.57%     
==========================================
  Files          30       35       +5     
  Lines        1663     1986     +323     
==========================================
+ Hits         1014     1262     +248     
- Misses        613      683      +70     
- Partials       36       41       +5

Impacted Files	Coverage Δ
cmd/root.go	0% <ø> (ø)	⬆️
server/events/vcs/gitlab_client.go	0% <0%> (ø)
server/events/vcs/proxy.go	0% <0%> (ø)
server/events/apply_executor.go	0% <0%> (ø)	⬆️
server/events/vcs/github_client.go	0% <0%> (ø)
server/events/vcs/not_configured_vcs_client.go	0% <0%> (ø)
server/logging/simple_logger.go	0% <0%> (ø)	⬆️
server/events/vcs/vcs.go	0% <0%> (ø)
server/events/plan_executor.go	88.05% <100%> (ø)	⬆️
server/events_controller.go	100% <100%> (ø)	⬆️
... and 17 more

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