Allow security group name/description to be updated

[Aaron Rosen]

Currently there is no way to do this.

[Tomoe Sugihara (tomoe)]

Could someone change the status back to New. I merely referred to this issue from a commit message for another issue 1119080, and haven't started.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/21490
Committed: http://github.com/openstack/quantum/commit/434534652d8f350cd3419605b8d8d22b078727b1
Submitter: Jenkins
Branch: master

commit 434534652d8f350cd3419605b8d8d22b078727b1
Author: Tomoe Sugihara <email address hidden>
Date: Mon Feb 18 15:24:55 2013 +0900

    Fix SG interface to reflect the reality

    The signitures of abstract methods in SecurityGroupPluginBase
    has diverged from db mixin implementation.
    This patch updates the methods to fix the divergence, mainly
    by removing update method from the base. Note that there's an
    issue for missing update(bug #1124865).

    Fixes: bug #1119080

    Change-Id: I6631b86ab2fdf4b81ad575e9a8f92dfe041ffe9a
    Signed-off-by: Tomoe Sugihara <email address hidden>