Delete unnecessary permissions on panel

Admin dashboard is already set 'openstack.roles.admin',
so same permission on panel in Admin dashboard is unncessary.

Change-Id: Ib7001042456b4c6ab32273a7b80951d551e32c9a
Closes-bug: #1532156

openstack_dashboard/dashboards/admin/hypervisors/panel.py

@@ -20,4 +20,4 @@ import horizon
 class Hypervisors(horizon.Panel):
     name = _("Hypervisors")
     slug = 'hypervisors'
-    permissions = ('openstack.roles.admin', 'openstack.services.compute')
+    permissions = ('openstack.services.compute',)

openstack_dashboard/dashboards/admin/instances/panel.py

@@ -24,4 +24,4 @@ import horizon
 class Instances(horizon.Panel):
     name = _("Instances")
     slug = 'instances'
-    permissions = ('openstack.roles.admin', 'openstack.services.compute')
+    permissions = ('openstack.services.compute',)

openstack_dashboard/dashboards/admin/metadata_defs/panel.py

@@ -23,7 +23,6 @@ from openstack_dashboard.api import glance
 class MetadataDefinitions(horizon.Panel):
     name = _("Metadata Definitions")
     slug = 'metadata_defs'
-    permissions = ('openstack.roles.admin',)
 
     @staticmethod
     def can_register():

openstack_dashboard/dashboards/admin/overview/panel.py

@@ -26,7 +26,6 @@ from openstack_dashboard.dashboards.admin import dashboard
 class Overview(horizon.Panel):
     name = _("Overview")
     slug = 'overview'
-    permissions = ('openstack.roles.admin',)
 
 
 dashboard.Admin.register(Overview)