Remove skips for bug 1182384

Commit a2ccca0 fixed some negative tests to check for neutron when
determining the invalid ID to use for nova APIs that behave differently
when using neutron vs nova-network.

This patch uses the same idea to remove the skips in place for bug
1182384 in the compute security group negative tests.

Closes-Bug: #1182384

Change-Id: I58ba125012a74ea49311a163e9bf7fd7af33c1fc
Merge "Remove skips for bug 1182384"