Check share-network in 'share create' API

For the moment it is possible to schedule share creation with DHSS=true
share type but without share network. But it makes no sense, and
expected to fail. So, perform check on API level.

APIImpact
When create share with share type(DHSS=true) and not input share
network, API will return HTTPBadRequest and message:
"Share network must be set when the driver_handles_share_servers
is true."

Closes-Bug: #1525125
Change-Id: Icdfabff7b1d3b6e95dd1dd58a0155de637056657
diff --git a/manila_tempest_tests/tests/api/admin/test_quotas_negative.py b/manila_tempest_tests/tests/api/admin/test_quotas_negative.py
index 985bef4..d5452ed 100644
--- a/manila_tempest_tests/tests/api/admin/test_quotas_negative.py
+++ b/manila_tempest_tests/tests/api/admin/test_quotas_negative.py
@@ -102,7 +102,7 @@
 
         # try schedule share with size, bigger than gigabytes quota
         self.assertRaises(lib_exc.OverLimit,
-                          self.shares_client.create_share,
+                          self.create_share,
                           size=overquota)
 
     @test.attr(type=["gate", "smoke", "negative"])