PostReceiveHook: add support for Git push options

John Cairequested to merge
jc-add-push-options into master

fixes: #2358 (closed)

To support git push options, gitaly-hooks will pass GIT_PUSH_OPTION_{#i} as an array into the RPC request to PostReceiveHookRequest. Then, in the hook RPC we turn these into GIT_PUSH_OPTION_COUNT and GIT_PUSH_OPTION_{#i} when calling the ruby hook.

Edited by GitLab Release Tools Bot

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