Initial commit of Ansible support for the Consul clustering framework (http://consul.io).

Submission includes support for
 - creating and registering services and checks
 - reading, writing and lookup for values in consul's kv store
 - creating and manipulating sessions for distributed locking on values in the kv
 - creating and manipulating ACLs for restricting access to the kv store
 - inventory support that reads the Consul catalog and group nodes according to
     - datacenters
     - exposed services
     - service availability
     - arbitrary groupings from the kv store

This submission makes extensive use of the python-consul library and this is required
as a dependency and can be installed from pip.

The tests were written to target a vagrant cluster which can be setup by following the
instructions here http://github.com/sgargan/consul-vagrant

test/integration/roles/test_consul_acl/tasks/main.yml

@@ -0,0 +1,42 @@
+- name: create a new acl token
+  consul_acl:
+    mgmt_token: '{{mgmt_token}}'
+    host: '{{acl_host}}'
+    name: 'New ACL'
+  register: new_ruleless
+
+- name: verify ruleless key created
+  assert:
+    that:
+      - new_ruleless.token | length == 36
+      - new_ruleless.name == 'New ACL'
+
+- name: add rules to an acl token
+  consul_acl:
+    mgmt_token: '{{mgmt_token}}'
+    host: '{{acl_host}}'
+    name: 'With rule'
+    rules:
+      - key: 'foo'
+        policy: read
+      - key: 'private/foo'
+        policy: deny
+  register: with_rules
+
+- name: verify rules created
+  assert:
+    that:
+      - with_rules.token | length == 36
+      - with_rules.name == 'With rule'
+      - with_rules.rules | match('.*"foo".*')
+      - with_rules.rules | match('.*"private/foo".*')
+
+- name: clear up
+  consul_acl:
+    mgmt_token: '{{mgmt_token}}'
+    host: '{{acl_host}}'
+    token: '{{item}}'
+    state: absent
+  with_items:
+    - '{{new_ruleless.token}}'
+    - '{{with_rules.token}}'