Fix entrypoints for quotas

currently they are pointing to non-existing code/classes which breaks
all sort of things, including bash completion in openstackclient.

Change-Id: I89e266b9d85f4168fd593ad9a05878b902e5315e
Closes-Bug: #1762316
(cherry picked from commit 1dec8995)

setup.cfg

@@ -46,11 +46,11 @@ openstack.container_infra.v1 =
     coe_ca_show = magnumclient.osc.v1.certificates:ShowCa
     coe_ca_sign = magnumclient.osc.v1.certificates:SignCa
     coe_stats_list = magnumclient.osc.v1.stats:ListStats
-    coe_quotas_create = magclient.osc.v1.quotas:CreateQuotas
-    coe_quotas_delete = magclient.osc.v1.quotas:DeleteQuotas
-    coe_quotas_update = magclient.osc.v1.quotas:UpdateQuotas
-    coe_quotas_show = magclient.osc.v1.quotas:ShowQuotas
-    coe_quotas_list = magclient.osc.v1.quotas:ListQuotas
+    coe_quotas_create = magnumclient.osc.v1.quotas:CreateQuotas
+    coe_quotas_delete = magnumclient.osc.v1.quotas:DeleteQuotas
+    coe_quotas_update = magnumclient.osc.v1.quotas:UpdateQuotas
+    coe_quotas_show = magnumclient.osc.v1.quotas:ShowQuotas
+    coe_quotas_list = magnumclient.osc.v1.quotas:ListQuotas
 
     coe_service_list = magnumclient.osc.v1.mservices:ListService