server-group-list don't support 'all_projects' parameter

[Rui Chen]

server-group-list command don't support 'all_projects' parameter, so admin users can't list the other tenants server group using cli.

Reproduce steps:
1. execute 'nova help server-group-list'

Expect result:
can use '--all-projects' parameter in order to list other tenant server group.

Actual result:
Nothing.

stack@devstack:/opt/stack/python-novaclient$ [master]$ nova help server-group-list
usage: nova server-group-list

Print a list of all server groups.

code base:
$ git log -1
commit 0e35f2a2fabe5beae065cc92c44f653ff76e6558

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/182568

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/182568
Committed: https://git.openstack.org/cgit/openstack/python-novaclient/commit/?id=9cfecf922a27703f05f220c1cacd6e5d71733453
Submitter: Jenkins
Branch: master

commit 9cfecf922a27703f05f220c1cacd6e5d71733453
Author: Rui Chen <email address hidden>
Date: Wed May 13 16:06:21 2015 +0800

    server-group-list support 'all_projects' parameter

    Supporting 'all_projects' in server-group-list so that
    admin users can list other tenant's server groups.

    Change-Id: Ie50288464ebc6585590a1a74efa8804584771ebc
    Closes-Bug: #1454523