Move the required module to heatclient/common.
- heatclient/openstack/common/apiclient/base.py
It also moves some required functions and exceptions from
heatclient/openstack/common/cliutils.py and
heatclient/openstack/common/exceptions.py.
Change-Id: I68704c7fab9417492d8390ad05a9797f78d46907