Revert "skip get-me-a-network tests"

This reverts commit e87e612144003c6a05549fa345999ad8058ad94c.

Neutron pushed the fix in change:

I3d62af3018fb834ec85771d8bc8e7379cc80b72a

Change-Id: Id610479b59b0a6756b4b745683bd5d004c36e4a0
Related-Bug: #1615710
diff --git a/tempest/api/compute/admin/test_auto_allocate_network.py b/tempest/api/compute/admin/test_auto_allocate_network.py
index cf0b960..052c17d 100644
--- a/tempest/api/compute/admin/test_auto_allocate_network.py
+++ b/tempest/api/compute/admin/test_auto_allocate_network.py
@@ -45,7 +45,6 @@
     @classmethod
     def skip_checks(cls):
         super(AutoAllocateNetworkTest, cls).skip_checks()
-        raise cls.skipException("Disabled until bug #1616498 is fixed")
         if not CONF.service_available.neutron:
             raise cls.skipException('Neutron is required')
         if not test.is_extension_enabled('auto-allocated-topology', 'network'):