Add git tags updating with RECLONE=yes

Registered by Evgeniy Afonichev

Current implementation of git_clone doesn't handle correctly git tags. For example it would be great to clone nova to specific tag. It works fine with existing code (providing NOVA_BRANCH=folsom-2) until you provide RECLONE=yes.
Also, keep in mind that the tag can be re-tagged.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Medium
Drafter:
None
Direction:
Approved
Assignee:
Evgeniy Afonichev
Definition:
New
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Evgeniy Afonichev
Completed by
Dean Troyer

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git_clone handles tags correctly with RECLONE=yes now

Gerrit topic: https://review.openstack.org/#/q/topic:git-clone-tags-support,n,z

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