Remove new= argument from create_connection

It has been marked deprecated [1] and recently removed. [2]

[1] I57b0229c2b6028796cd10bbbfc9b166cf8a6dab0
[2] I550c65861a8664068e340b7b4689b2345951e888

Closes-Bug: #1570202
Closes-Bug: #1570840

This commit also includes the following change,
to workaround gate job failure:
-------
devstackgaterc: Exclude tempest plugins

This is a temporary workaround for neutron tempest plugin issues.
Note: this also disables our own tempest plugin.

Related-Bug: #1571486
Change-Id: I072c145858793389f162304b1aad90ebc7e9c79b
-------

Change-Id: Ia384be8d13431dbd6327a6bb689622d8d3731538

devstack/devstackgaterc

@@ -39,3 +39,5 @@ r="$r)"
 r="$r(tempest\.(api.network\.|scenario.test_network)|neutron_taas\.).*$"
 
 export DEVSTACK_GATE_TEMPEST_REGEX="$r"
+# bug 1571486
+export DEVSTACK_GATE_TEMPEST_ALL_PLUGINS=0

neutron_taas/services/taas/agents/ovs/agent.py

@@ -58,7 +58,7 @@ def main():
     # Set up RPC
     mgr = taas_ovs_agent.TaasOvsAgentRpcCallback(cfg.CONF)
     endpoints = [mgr]
-    conn = n_rpc.create_connection(new=True)
+    conn = n_rpc.create_connection()
     conn.create_consumer(topics.TAAS_AGENT, endpoints, fanout=False)
     conn.consume_in_threads()
 

neutron_taas/services/taas/taas_plugin.py

@@ -95,7 +95,7 @@ class TaasPlugin(taas_db.Tass_db_Mixin):
         LOG.debug("TAAS PLUGIN INITIALIZED")
         self.endpoints = [TaasCallbacks(self)]
 
-        self.conn = n_rpc.create_connection(new=True)
+        self.conn = n_rpc.create_connection()
         self.conn.create_consumer(
             topics.TAAS_PLUGIN, self.endpoints, fanout=False)
         self.conn.consume_in_threads()