Merging fix for "Stop messing with networks we did not create" from mesa-1.6.1 to roxy.

See https://github.com/crowbar/barclamp-quantum/pull/86
Merge pull request #137 from cdearborn/pull-req-release-roxy-master-39731fee332c561b9b3af24306d9ea8d566bbe9c

Merging fix from mesa-1.6.1 [1/1]