azure: Warn about memory issues
    
    The nonzero number of memory/memory+Swap usage hits limits may
    indicate the possible env instability(crashes, random failures, etc.).
    
    > memory.failcnt		 # show the number of memory usage hits limits
      memory.memsw.failcnt		 # show the number of memory+Swap hits limits
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>