There are some situations where we did not clean up CIB backup files
correctly:
1) When a pcs show command was invoked
2) When we hit the maximum number of retries.
3) When the original file and the copy cib file are identical and we
still called push_config() (very unlikely but we best clean that up)
Let's remove these files in both of these cases.
Closes-Bug: #1667145
Change-Id: I41404d569d81973c4b9531266c7a6c09904d1baf
fe4d448938