site.sh-configurable KVM rollbacks

*** 5,9 ****
--- 5,14 ----
  # Uncommenting this line will create a on-disk repo in
  # the top level of your checkout and publish there instead
  # of the URI specified above.
  #
  #PKGSRVR=file:///$MYDIR/../tmp.repo/
+ 
+ # These two should be uncommented and set to specific git changeset IDs
+ # if illumos-kvm and illumos-kvm-cmd get too far ahead of illumos-{gate,omnios}.
+ #KVM_ROLLBACK=a8ea37e8deb99265682c66c23f787f704e77fb91
+ #KVM_CMD_ROLLBACK=1c6181be55d1cadc4426069960688307a6083131