Replace old httpclient with requests

This review implements blueprint python-request and replaces the old
http client implementation in favor of a new one based on
python-requests.

Major changes:
* raw_request and json_request removed since everything is now being
  handled by the same method "_request"
* New methods that match HTTP's methods were added:
    - get
    - put
    - post
    - head
    - patch
    - delete
* Content-Type is now being "inferred" based on the data being sent:
    - if it is file-like object it chunks the request
    - if it is a python type not instance of basestring then it'll try
      to serialize it to json
    - Every other case will keep the incoming content-type and will send
      the data as is.
* Glanceclient's HTTPSConnection implementation will be used if
  no-compression flag is set to True.

Co-Author:  Flavio Percoco<flaper87@gmail.com>
Change-Id: I09f70eee3e2777f52ce040296015d41649c2586a

glanceclient/v1/client.py

@@ -13,10 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from glanceclient.common import http
+from glanceclient.common.http import HTTPClient
 from glanceclient.common import utils
-from glanceclient.v1 import image_members
-from glanceclient.v1 import images
+from glanceclient.v1.image_members import ImageMemberManager
+from glanceclient.v1.images import ImageManager
 
 
 class Client(object):
@@ -31,7 +31,7 @@ class Client(object):
 
     def __init__(self, endpoint, *args, **kwargs):
         """Initialize a new client for the Images v1 API."""
-        self.http_client = http.HTTPClient(utils.strip_version(endpoint),
-                                           *args, **kwargs)
-        self.images = images.ImageManager(self.http_client)
-        self.image_members = image_members.ImageMemberManager(self.http_client)
+        self.http_client = HTTPClient(utils.strip_version(endpoint),
+                                      *args, **kwargs)
+        self.images = ImageManager(self.http_client)
+        self.image_members = ImageMemberManager(self.http_client)