Fix custom conf files referencing

The cli args neutron-conf/nsx-conf we had until this
point to conf files not in the default locations didn't
work. This is because of the below code section,
https://github.com/openstack/oslo.config/blob/master/oslo_config/cfg.py#L2580

the above states reloading the conf options only from the
ones passed as --config-file. So that's the only way to pass
new config files to oslo.config.

So if someone wants to pass a custom neutron.conf/nsx.ini to
admin utility, they can do:
nsxadmin --config-file custom_path/neutron.conf --config-file
custom_path/nsx.ini -r <resource> -o <operation>

This patch removes neutron_conf and nsx_conf options from the cli
and users should use --config-file option to specify any config files.

Change-Id: Ia5048875fd465d46aa6f85cd02278d778eb6017e

tools/python_nsxadmin/admin/plugins/common/constants.py

@@ -12,6 +12,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+# Default conf file locations
+NEUTRON_CONF = '/etc/neutron/neutron.conf'
+NSX_INI = '/etc/neutron/plugins/vmware/nsx.ini'
+
 # NSX Plugin Constants
 NSXV3_PLUGIN = 'vmware_nsx.plugin.NsxV3Plugin'
 NSXV_PLUGIN = 'vmware_nsx.plugin.NsxVPlugin'

tools/python_nsxadmin/admin/shell.py

@@ -114,13 +114,7 @@ def _get_resources():
                modules)
 
 
-cli_opts = [cfg.StrOpt('neutron-conf',
-                       default='/etc/neutron/neutron.conf',
-                       help='Neutron configuration file'),
-            cfg.StrOpt('nsx-conf',
-                       default='/etc/neutron/plugins/vmware/nsx.ini',
-                       help='NSX configuration file'),
-            cfg.StrOpt('fmt',
+cli_opts = [cfg.StrOpt('fmt',
                        short='f',
                        default='psql',
                        choices=['psql', 'json'],
@@ -169,8 +163,8 @@ def _init_cfg():
              prog='Admin Utility',
              version=version.__version__,
              usage='nsxadmin -r <resources> -o <operation>',
-             default_config_files=[cfg.CONF.neutron_conf,
-                                   cfg.CONF.nsx_conf])
+             default_config_files=[constants.NEUTRON_CONF,
+                                   constants.NSX_INI])
 
 
 def _validate_resource_choice(resource, nsx_plugin):
@@ -205,7 +199,6 @@ def _validate_op_choice(choice, nsx_plugin):
 def main(argv=sys.argv[1:]):
     _init_cfg()
     _init_resource_plugin()
-
     nsx_plugin_in_use = _get_plugin()
     LOG.info(_LI('NSX Plugin in use: %s'), nsx_plugin_in_use)