Add apache support script for solum API

This patch add scripts for running API services via apache.
The follow-up patch will add the devstack install support.

bp: https://blueprints.launchpad.net/solum/+spec/solum-api-under-wsgi
ref: https://github.com/openstack/heat/blob/master/heat/httpd/heat_api.py

Change-Id: Ia1c892e1b53b2d0ac247f33604cf891792a829a9
Partially-Implements: blueprint solum-api-under-wsgi

setup.cfg

@@ -53,6 +53,9 @@ console_scripts =
     solum-deployer = solum.cmd.deployer:main
     solum-worker = solum.cmd.worker:main
 
+wsgi_scripts =
+    solum-wsgi-api = solum.httpd.solum_api:init_application
+
 mistral.actions =
     solum.create_image = solum.mistral_actions.builder:CreateImageAction
     solum.get_image_id = solum.mistral_actions.builder:GetImageIdAction

solum/httpd/solum_api.py

@@ -0,0 +1,43 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+"""WSGI script for solum-api.
+
+Script for running solum-api under Apache2.
+"""
+
+from oslo_config import cfg
+import oslo_i18n as i18n
+from oslo_log import log as logging
+
+from solum.api import app as api_app
+from solum.common import config
+from solum import objects
+
+
+def init_application():
+    i18n.enable_lazy()
+
+    LOG = logging.getLogger('solum.api')
+
+    logging.register_options(cfg.CONF)
+    cfg.CONF(project='solum')
+    logging.setup(cfg.CONF, 'solum')
+
+    config.set_config_defaults()
+    objects.load()
+
+    port = cfg.CONF.api.port
+    host = cfg.CONF.api.host
+    LOG.info(('Starting Solum REST API on %(host)s:%(port)s'),
+             {'host': host, 'port': port})
+    return api_app.setup_app()