Move old oslo-incubator code out of openstack/common

As part of the first community-wide goal, teams were asked to
remove the openstack/common package of their projects if one
existed. This was a byproduct of the old oslo-incubator form
of syncing common functionality.

Package openstack/common/apiclient is moved to glanceclient/v1
package as it is used by v1 api only.

NOTE:
Removed glanceclient/common/base.py as it is deprecated and not
used anywhere.

Closes-Bug: #1639487
Change-Id: Ib3ac09743ce761ab0186e99e1c9de02517f89510

tox.ini

@@ -44,7 +44,7 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 [flake8]
 ignore = F403,F812,F821
 show-source = True
-exclude = .venv*,.tox,dist,*egg,build,.git,doc,*openstack/common*,*lib/python*,.update-venv
+exclude = .venv*,.tox,dist,*egg,build,.git,doc,*lib/python*,.update-venv
 
 [hacking]
 import_exceptions = six.moves,glanceclient._i18n