Khai Do 0e89f115a3 run git gc instead of repack for git repos
Run git gc instead of repack on all repos.  Testing[1] indicates that
gc-ing reduces repo size and helps maintain better performance for
apps that host the repos.

remove git pack-refs because a git gc enables packRefs by default[2]

[1] http://lists.openstack.org/pipermail/openstack-infra/2016-June/004403.html
[2] https://git-scm.com/docs/git-gc

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