The ceph.conf was being written with 0x444 permissions, which means
the file could not be updated if it already exists. Specifically, when
an osd is purged, if the operation is retried multiple times, only
the first operation was succeeding. The subsequent requests to purge
an osd were failing due to the config already existing. If we make
the config writeable with 0x644 then the operator can always write the file.
Signed-off-by: Travis Nielsen <tnielsen@redhat.com>