Add api and manager states and metadata

* api state configures and starts octavia-api service
* manager state configures and starts the following services:
  - octavia-worker
  - octavia-health-manager
  - octavia-housekeeping

Added tests and updated the README.rst

Change-Id: I41c3097ff400b07d659d8aa845d295fbda480cd3
diff --git a/tests/pillar/api_single.sls b/tests/pillar/api_single.sls
new file mode 100644
index 0000000..29ab5f7
--- /dev/null
+++ b/tests/pillar/api_single.sls
@@ -0,0 +1,32 @@
+octavia:
+  api:
+    enabled: true
+    version: ocata
+    bind:
+      address: 127.0.0.1
+      port: 9876
+    database:
+      engine: mysql
+      host: 127.0.0.1
+      port: 3306
+      name: octavia
+      user: octavia
+      password: password
+    identity:
+      engine: keystone
+      region: RegionOne
+      host: 127.0.0.1
+      port: 35357
+      user: octavia
+      password: password
+      tenant: service
+    message_queue:
+      engine: rabbitmq
+      host: 127.0.0.1
+      port: 5672
+      user: openstack
+      password: password
+      virtual_host: '/openstack'
+    haproxy_amphora:
+        client_cert: '/etc/octavia/certs/client.pem'
+        server_ca: '/etc/octavia/certs/ca_01.pem'