Fixing race condition when infrastructure nodes acts as computes

Issue: GlusterFS puts locks on metadata and running highstate on
       all glusterfs nodes asynchronously may cause race condition

Fix:   Highstates should be run one by one on glusterfs nodes in
       this case.

Change-Id: I090d87230f78e7e8b184925e4fad0f99ba36fe3f
1 file changed