Added support for host update

Added a update action in hosts client.
Added a request model for host update.
Added a generic response model for any
response from host update action.

Change-Id: I3e2b534c7cf4e88b91d57730035beb9f04e89215

cloudcafe/compute/hosts_api/models/requests.py

@@ -0,0 +1,46 @@
+"""
+Copyright 2013 Rackspace
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+import json
+import xml.etree.ElementTree as ET
+
+from cafe.engine.models.base import AutoMarshallingModel
+from cloudcafe.compute.common.constants import Constants
+
+
+class UpdateHostRequest(AutoMarshallingModel):
+    """
+    @summary: Update Request for a Host
+    """
+    ROOT_TAG_XML = "updates"
+
+    def __init__(self, status=None, maintenance_mode=None):
+        if status is not None:
+            self.status = status
+        if maintenance_mode is not None:
+            self.maintenance_mode = maintenance_mode
+
+    def _obj_to_json(self):
+        return json.dumps(self.__dict__)
+
+    def _obj_to_xml(self):
+        xml = Constants.XML_HEADER
+        element = ET.Element(self.ROOT_TAG_XML)
+        for key, value in self.__dict__.iteritems():
+            child = ET.Element(key)
+            child.text = value
+            element.append(child)
+        xml += ET.tostring(element)
+        return xml

cloudcafe/compute/hosts_api/models/responses.py

@@ -0,0 +1,39 @@
+"""
+Copyright 2013 Rackspace
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+import json
+import xml.etree.ElementTree as ET
+
+from cafe.engine.models.base import AutoMarshallingModel
+
+
+class HostUpdateResponse(AutoMarshallingModel):
+    """
+    @summary: A Generic response for any host action.
+    """
+
+    def __init__(self, **kwargs):
+        for key, value in kwargs.iteritems():
+            setattr(self, key, value)
+
+    @classmethod
+    def _json_to_obj(cls, serialized_str):
+        json_dict = json.loads(serialized_str)
+        return HostUpdateResponse(**json_dict)
+
+    @classmethod
+    def _xml_to_obj(cls, serialized_str):
+        element = ET.fromstring(serialized_str)
+        return HostUpdateResponse(**element.attrib)