Correct log message when removing a security group
Correct log message when removing a security group

When a security group is removed from a port nova
incorrectly logs this as a security group addition

Change-Id: If525313c63c4553abe8bea6f2bfaf75431ed18ea
Closes-bug: 1731889
(cherry picked from commit 01da04a0a7eff4c52bd0e35d404545f9a413b602)

vmturbo/nova,vmturbo/nova,vmturbo/nova,vmturbo/nova