add service tests

1. list service by some params combination
2. enable/disable service

Change-Id: If7aeffbb866da276a4d295fc1db03f38b462cd00
diff --git a/tempest/services/compute/xml/services_client.py b/tempest/services/compute/xml/services_client.py
index ce23403..ac304e2 100644
--- a/tempest/services/compute/xml/services_client.py
+++ b/tempest/services/compute/xml/services_client.py
@@ -1,6 +1,7 @@
 # vim: tabstop=4 shiftwidth=4 softtabstop=4
 
 # Copyright 2013 NEC Corporation
+# Copyright 2013 IBM Corp.
 # All Rights Reserved.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -15,8 +16,12 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import urllib
+
 from lxml import etree
 from tempest.common.rest_client import RestClientXML
+from tempest.services.compute.xml.common import Document
+from tempest.services.compute.xml.common import Element
 from tempest.services.compute.xml.common import xml_to_json
 
 
@@ -27,8 +32,42 @@
                                                 auth_url, tenant_name)
         self.service = self.config.compute.catalog_type
 
-    def list_services(self):
-        resp, body = self.get("os-services", self.headers)
+    def list_services(self, params=None):
+        url = 'os-services'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+
+        resp, body = self.get(url, self.headers)
         node = etree.fromstring(body)
         body = [xml_to_json(x) for x in node.getchildren()]
         return resp, body
+
+    def enable_service(self, host_name, binary):
+        """
+        Enable service on a host
+        host_name: Name of host
+        binary: Service binary
+        """
+        post_body = Element("service")
+        post_body.add_attr('binary', binary)
+        post_body.add_attr('host', host_name)
+
+        resp, body = self.put('os-services/enable', str(Document(post_body)),
+                              self.headers)
+        body = xml_to_json(etree.fromstring(body))
+        return resp, body
+
+    def disable_service(self, host_name, binary):
+        """
+        Disable service on a host
+        host_name: Name of host
+        binary: Service binary
+        """
+        post_body = Element("service")
+        post_body.add_attr('binary', binary)
+        post_body.add_attr('host', host_name)
+
+        resp, body = self.put('os-services/disable', str(Document(post_body)),
+                              self.headers)
+        body = xml_to_json(etree.fromstring(body))
+        return resp, body