Reuse class Manager from common code

Class `Managers` from `glanceclient.common.base` module is similar to
class `apiclient:ManagerWithFind` from common code.

In this patch:
- class glanceclient.common.base:Managers replaced by
apiclient:ManagerWithFind
- module glanceclient.common.base marked as 'deprecated'

Related to bp common-client-library-2

Change-Id: I41da4a9188e97ca2c07b6234fc2ac0a877553d3f
Merge "Reuse class Manager from common code"