Revert "Revert "Restart bits varnish on cache allocation failures""

This reverts commit 45071cbbad9760eef69d117630128cce2b45e890

Change-Id: I8dc2b53f01e04a0703af9f66631a7072e194ade9
Merge "Revert "Revert "Restart bits varnish on cache allocation failures""" into production