Sync latest code and reuse exceptions from oslo

Module `ironicclient.exc` contains exceptions which equal to exceptions
from oslo common code.
This patch:
- sync latest code of `apiclient.exceptions`(hash of last commit in oslo
related to apiclient.exceptions: 3570f44d5ccf52c59cc586bed1446b874fc3c07c)
- reuses exceptions from common code
- removes needless exceptions from `ironicclient.exc`

Related to bp common-client-library-2

Change-Id: I784007f36dd6a63fc4c77e0d0f0f000e05eb792f
Merge "Sync latest code and reuse exceptions from oslo"