Add update method of security group name and description

make it possible to edit the name and description of
common security groups, we can not rename the default.
nova patch : https://review.openstack.org/#/c/29490/

Fixes: bug #918393

Change-Id: I559f2fa09c1f205d3bbe7352fc169152e6b38586
Merge "Add update method of security group name and description"