Add support for 'connection' concept

This is a large refactor and as small as I could feasibly make it
while keeping the tests working. I'll do the documentation and
touch ups in the next commit to make digesting easier.

Change-Id: Iac5083996a183d1d8a9b6cb8f70836f7c39ee910
diff --git a/tests/test_layoutvalidator.py b/tests/test_layoutvalidator.py
index 5a8fc46..3dc3234 100644
--- a/tests/test_layoutvalidator.py
+++ b/tests/test_layoutvalidator.py
@@ -14,6 +14,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import ConfigParser
 import os
 import re
 
@@ -22,6 +23,7 @@
 import yaml
 
 import zuul.layoutvalidator
+import zuul.lib.connections
 
 FIXTURE_DIR = os.path.join(os.path.dirname(__file__),
                            'fixtures')
@@ -38,19 +40,31 @@
             if not m:
                 continue
             print fn
+
+            # Load any .conf file by the same name but .conf extension.
+            config_file = ("%s.conf" %
+                           os.path.join(FIXTURE_DIR, 'layouts',
+                                        fn.split('.yaml')[0]))
+            if not os.path.isfile(config_file):
+                config_file = os.path.join(FIXTURE_DIR, 'layouts',
+                                           'zuul_default.conf')
+            config = ConfigParser.ConfigParser()
+            config.read(config_file)
+            connections = zuul.lib.connections.configure_connections(config)
+
             layout = os.path.join(FIXTURE_DIR, 'layouts', fn)
             data = yaml.load(open(layout))
             validator = zuul.layoutvalidator.LayoutValidator()
             if m.group(1) == 'good':
                 try:
-                    validator.validate(data)
+                    validator.validate(data, connections)
                 except voluptuous.Invalid as e:
                     raise Exception(
                         'Unexpected YAML syntax error in %s:\n  %s' %
                         (fn, str(e)))
             else:
                 try:
-                    validator.validate(data)
+                    validator.validate(data, connections)
                     raise Exception("Expected a YAML syntax error in %s." %
                                     fn)
                 except voluptuous.Invalid as e: