Right now, our hooks are installed by `git-webkit setup`. That works well for engineers, but services don't want the rest of `git-webkit setup`, they just want a subset of the hooks. Break out hook installation into a separate command, and invoke that command from `git-webkit setup`.
<rdar://problem/106716871>
Pull request: https://github.com/WebKit/WebKit/pull/11509
Committed 261653@main (a4daad5b9fbd): <https://commits.webkit.org/261653@main> Reviewed commits have been landed. Closing PR #11509 and removing active labels.
Committed 259548.422@safari-7615-branch (2632cd893f8e): <https://commits.webkit.org/259548.422@safari-7615-branch> Reviewed commits have been landed. Closing PR #459 and removing active labels.