Show all SG rules belong to SG in group's details
Show all SG rules belong to SG in group's details

If security group contains rule(s) which were created by different
user (admin), owner of this security group should see such rules
even if those rules don't belong to him.

This patch changes to use admin_context to get security group rules
in get_security_group() method to achieve that.

Test to cover such case is added in neutron-tempest-plugin repo.

Change-Id: I890c81bb6eabc5caa620ed4fcc4dc88ebfa6e1b0
Closes-Bug: #1824248

mahak/neutron,mahak/neutron,mahak/neutron,openstack/neutron,openstack/neutron,openstack/neutron