Use StrictHostKeyChecking set to no for init-keystone

Allows the user to not have to manually enter 'yes' during the run of
init-keystone.  Will allow init-keystone to be scripted as part of
devtest.sh, TOCI, etc.

Change-Id: I675ade1fa80365951e433a387eff22df18b871eb
Merge "Use StrictHostKeyChecking set to no for init-keystone"