Pass strings to git_config module rather than have implicit conversion
Pass strings to git_config module rather than have implicit conversion

This avoids the following warning:

[WARNING]: The value 0 (type int) in a string field was converted to u'0' (type
If this does not look like what you expect, quote the entire value to
ensure it does not change.

Change-Id: Ifaf4035b2101f6921182c3d3275554c7e5f4cfa2

openstack/openstack-ansible-repo_server,openstack/openstack-ansible-repo_server