ability to adjust session max_retries
ability to adjust session max_retries

The patch add the ability to pass a max_retries value during DciContext
creation. This give the user the ability to define the number of
retries, a request should do before giving up.

Change-Id: I3d54851f07dc40844e81cdce7daa6075bd3fed28

redhat-cip/python-dciclient,redhat-cip/python-dciclient