Trivial: Import network.common as network_common in server.py

In server.py, identity.common is imported as identity_common.
But network.common is imported as common, which is confuseing.
This patch imports network.common as network_common.

Change-Id: I74295bc88b22de398ab64fe556aedaca2453d17d

Author: tang-chen

openstackclient/compute/v2/server.py

@@ -37,7 +37,7 @@
 from openstackclient.common import utils
 from openstackclient.i18n import _  # noqa
 from openstackclient.identity import common as identity_common
-from openstackclient.network import common
+from openstackclient.network import common as network_common
 
 
 def _format_servers_list_networks(networks):
@@ -476,15 +476,19 @@ def take_action(self, parsed_args):
             if neutron_enabled:
                 network_client = self.app.client_manager.network
                 if nic_info["net-id"]:
-                    nic_info["net-id"] = common.find(network_client,
-                                                     'network',
-                                                     'networks',
-                                                     nic_info["net-id"])
+                    nic_info["net-id"] = network_common.find(
+                        network_client,
+                        'network',
+                        'networks',
+                        nic_info["net-id"]
+                    )
                 if nic_info["port-id"]:
-                    nic_info["port-id"] = common.find(network_client,
-                                                      'port',
-                                                      'ports',
-                                                      nic_info["port-id"])
+                    nic_info["port-id"] = network_common.find(
+                        network_client,
+                        'port',
+                        'ports',
+                        nic_info["port-id"]
+                    )
             else:
                 if nic_info["net-id"]:
                     nic_info["net-id"] = utils.find_resource(