Downgrade git review to version 1.17 on jenkins slaves. Do this to avoid
bugs in 1.18.
Change-Id: I3102be5cabbc44a7e88206a6d2506bc7315c88f7
Reviewed-on: https://review.openstack.org/12986
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins