PEP 8 Public and internal interfaces

Define which interfaces are public and which are internal based
on PEP 8.

For reference, PEP 8 section is here:
http://www.python.org/dev/peps/pep-0008/#public-and-internal-interfaces

Change-Id: I14233796b7838b78fbd355014478f3e326542966

keystoneclient/__init__.py

@@ -17,3 +17,17 @@ import pbr.version
 
 
 __version__ = pbr.version.VersionInfo('python-keystoneclient').version_string()
+
+__all__ = [
+    # Modules
+    'generic',
+    'v2_0',
+    'v3',
+
+    # Packages
+    'access',
+    'client',
+    'exceptions',
+    'httpclient',
+    'service_catalog',
+]

keystoneclient/apiclient/__init__.py

@@ -14,3 +14,8 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+
+
+__all__ = [
+    'exceptions',
+]

keystoneclient/generic/__init__.py

@@ -0,0 +1,4 @@
+
+__all__ = [
+    'client',
+]

keystoneclient/v2_0/__init__.py

@@ -1,2 +1,7 @@
 # flake8: noqa
 from keystoneclient.v2_0.client import Client
+
+
+__all__ = [
+    'client',
+]

keystoneclient/v3/__init__.py

@@ -1,2 +1,7 @@
 # flake8: noqa
 from keystoneclient.v3.client import Client
+
+
+__all__ = [
+    'client',
+]

keystoneclient/v3/contrib/__init__.py

@@ -0,0 +1,3 @@
+
+__all__ = [
+]