Michael Johnson 7d6322ae08 Switch back to using git for the agent ref
A diskimage-builder patch [1] broke our amphora-agent element by
uninstalling git prior to the post-install.d phase.
A followup patch in Octavia [2] changed how we get the git
reference to awking an git internal log file. This seems fragile
to me, so I am proposing this alternative.
This patch updates our element to finish using git before the
install.d phase is complete.

[1] https://review.opendev.org/745678
[2] https://review.opendev.org/745683

Change-Id: I9a346b626f852171ec00d2868ccb6f98b1fb8994
2020-08-18 11:27:51 -07:00
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