Remove unintended exposure of private attribute
Remove unintended exposure of private attribute

GaneshaNASHelper has a class attribute confrx that is
currently coded up as a public variable. This was unintended.

Made the following changes to fix this:
1. The variable name was updated from confrx to _confrx
per pep8 guidelines for defining non-public variables and instances.
2. All references to this variable have been updated.

Depends-On: Id7d43dee256856062bd0dadad9c469c1500ee36e
Change-Id: Ie4fe96cd9cf9f0ea281c94f5c1378b255f60bada
Co-Authored-By: Andrea Ma <5c31664794aa72a371b73ab5464d7f12f327d187@us.ibm.com>
Co-Authored-By: Andrei Ta <fe3c03e01bab2b280e93f1ddd42256ab77670518@us.ibm.com>
Co-Authored-By: Michael Rowden <7ea60f122d5f406c51e32b0f9818bdc005f8537b@us.ibm.com>
Closes-Bug: #1551497

openstack/manila,NetApp/manila,openstack/manila,bswartz/manila,NetApp/manila,vponomaryov/manila,bswartz/manila,vponomaryov/manila