Enable hacking checks

Enabled following hacking checks from tox.ini:
- H233 Python 3.x incompatible use of print operator
- H303 no wildcard import
- H404 multi line docstring should start with a summary

Change-Id: I2553bcd3e80c00acc08d135a1d2dadfb6cda49fe
Partial-Bugs: #1475054

glanceclient/common/exceptions.py

@@ -1,3 +1,3 @@
 # This is here for compatibility purposes. Once all known OpenStack clients
 # are updated to use glanceclient.exc, this file should be removed
-from glanceclient.exc import *
+from glanceclient.exc import *  # noqa

glanceclient/common/https.py

@@ -52,7 +52,7 @@ from glanceclient import exc
 
 
 def verify_callback(host=None):
-    """
+    """Provide wrapper for do_verify_callback.
 
     We use a partial around the 'real' verify_callback function
     so that we can stash the host value without holding a
@@ -87,7 +87,7 @@ def do_verify_callback(connection, x509, errnum,
 
 
 def host_matches_cert(host, x509):
-    """
+    """Verify the certificate identifies the host.
 
     Verify that the x509 certificate we have received
     from 'host' correctly identifies the server we are
@@ -187,7 +187,7 @@ class HTTPSAdapter(adapters.HTTPAdapter):
 
 
 class HTTPSConnectionPool(connectionpool.HTTPSConnectionPool):
-    """
+    """A replacement for the default HTTPSConnectionPool.
 
     HTTPSConnectionPool will be instantiated when a new
     connection is requested to the HTTPSAdapter. This
@@ -232,10 +232,8 @@ class OpenSSLConnectionDelegator(object):
 
 
 class VerifiedHTTPSConnection(HTTPSConnection):
-    """
+    """Extended OpenSSL HTTPSConnection for enhanced SSL support.
 
-    Extended HTTPSConnection which uses the OpenSSL library
-    for enhanced SSL support.
     Note: Much of this functionality can eventually be replaced
           with native Python 3.3 code.
     """
@@ -325,10 +323,9 @@ class VerifiedHTTPSConnection(HTTPSConnection):
             self.context.set_default_verify_paths()
 
     def connect(self):
-        """
+        """Connect to an SSL port using the OpenSSL library.
 
-        Connect to an SSL port using the OpenSSL library
-        and apply per-connection parameters.
+        This method also applies per-connection parameters to the connection.
         """
         result = socket.getaddrinfo(self.host, self.port, 0,
                                     socket.SOCK_STREAM)

glanceclient/common/progressbar.py

@@ -19,7 +19,7 @@ import six
 
 
 class _ProgressBarBase(object):
-    """
+    """A progress bar provider for a wrapped obect.
 
     Base abstract class used by specific class wrapper to show
     a progress bar when the wrapped object are consumed.
@@ -51,10 +51,10 @@ class _ProgressBarBase(object):
 
 
 class VerboseFileWrapper(_ProgressBarBase):
-    """
+    """A file wrapper with a progress bar.
 
-    A file wrapper that show and advance a progress bar
-    whenever file's read method is called.
+    The file wrapper shows and advances a progress bar whenever the
+    wrapped file's read method is called.
     """
 
     def read(self, *args, **kwargs):
@@ -70,10 +70,11 @@ class VerboseFileWrapper(_ProgressBarBase):
 
 
 class VerboseIteratorWrapper(_ProgressBarBase):
-    """
+    """An iterator wrapper with a progress bar.
+
+    The iterator wrapper shows and advances a progress bar whenever the
+    wrapped data is consumed from the iterator.
 
-    An iterator wrapper that show and advance a progress bar whenever
-    data is consumed from the iterator.
     :note: Use only with iterator that yield strings.
     """