Set the base set of services

Use the test-matrix role from devstack-gate to define a base set of
services to be enabled for the controller and compute nodes.

Extend the local conf module to handle the base set of services.

Since the test-matrix defines services for primary and subnode nodes, we
need a multinode job to test that this works. Add a new host group
called subnode that includes the non-controller hosts. Add a new job
that runs devstack on a two nodes environment.

Using service from the test matrix enables swift in the gate, so we need
to set SWIFT_HASH for devstack to work.

Depends-on: Ie36ba0cd7cfcd450b75000a76a64d856f2a83eba
Depends-on: Id9ad3be4be25e699f77d6b5a252f046ce8234f45
Change-Id: I379abf482c89122533324e64fefbff3d5a618a89
diff --git a/roles/write-devstack-local-conf/library/devstack_local_conf.py b/roles/write-devstack-local-conf/library/devstack_local_conf.py
index dbd60f5..55ba4af 100644
--- a/roles/write-devstack-local-conf/library/devstack_local_conf.py
+++ b/roles/write-devstack-local-conf/library/devstack_local_conf.py
@@ -106,13 +106,13 @@
 
 class LocalConf(object):
 
-    def __init__(self, localrc, localconf, services, plugins):
+    def __init__(self, localrc, localconf, base_services, services, plugins):
         self.localrc = []
         self.meta_sections = {}
         if plugins:
             self.handle_plugins(plugins)
-        if services:
-            self.handle_services(services)
+        if services or base_services:
+            self.handle_services(base_services, services or {})
         if localrc:
             self.handle_localrc(localrc)
         if localconf:
@@ -123,9 +123,12 @@
             if v:
                 self.localrc.append('enable_plugin {} {}'.format(k, v))
 
-    def handle_services(self, services):
-        base_services = services.pop('base', True)
-        if not base_services:
+    def handle_services(self, base_services, services):
+        enable_base_services = services.pop('base', True)
+        if enable_base_services and base_services:
+            self.localrc.append('ENABLED_SERVICES={}'.format(
+                ",".join(base_services)))
+        else:
             self.localrc.append('disable_all_services')
         for k, v in services.items():
             if v is False:
@@ -164,6 +167,7 @@
     module = AnsibleModule(
         argument_spec=dict(
             plugins=dict(type='dict'),
+            base_services=dict(type='list'),
             services=dict(type='dict'),
             localrc=dict(type='dict'),
             local_conf=dict(type='dict'),
@@ -174,6 +178,7 @@
     p = module.params
     lc = LocalConf(p.get('localrc'),
                    p.get('local_conf'),
+                   p.get('base_services'),
                    p.get('services'),
                    p.get('plugins'))
     lc.write(p['path'])