Change generator config file from tox to oslo-config-generator

When restart tox script it will remove all python libraries and
download libraries again. In the case that git/pip frequently
timeout, this may cause failure of installation.
Closes-Bug: #1527961

Change-Id: I4671bb8436f38686c1ca638ea33a797bd23389a0

devstack/plugin.sh

@@ -64,8 +64,7 @@ if is_service_enabled kuryr; then
             else
                 echo -n "${KURYR_CONFIG} and the  default config missing. Auto generating and copying one... "
                 cd ${KURYR_HOME}
-                pip_install tox
-                tox -egenconfig
+                oslo-config-generator --config-file=${KURYR_CONFIG_GENERATOR}
                 sudo cp ${KURYR_DEFAULT_CONFIG}.sample ${KURYR_DEFAULT_CONFIG}
                 sudo cp ${KURYR_DEFAULT_CONFIG} ${KURYR_CONFIG}
                 cd -

devstack/settings

@@ -2,6 +2,8 @@
 KURYR_HOME=${KURYR_HOME:-$DEST/kuryr}
 KURYR_JSON_FILENAME=kuryr.json
 KURYR_DEFAULT_JSON=${KURYR_HOME}/etc/${KURYR_JSON_FILENAME}
+KURYR_CONFIG_GENERATOR_FILENAME=kuryr-config-generator.conf
+KURYR_CONFIG_GENERATOR=${KURYR_HOME}/etc/${KURYR_CONFIG_GENERATOR_FILENAME}
 
 # See libnetwork's plugin discovery mechanism:
 #   https://github.com/docker/docker/blob/c4d45b6a29a91f2fb5d7a51ac36572f2a9b295c6/docs/extend/plugin_api.md#plugin-discovery