Add https options and minor code changes

Add https options and minor code changes

Adds https options x_verify_certificate and x_verify_certificate_path
in DotHill and rebranded drivers.

Minor cosmetic changes like replacing 'realstor' with 'virtual'
and 'wbi' with 'api'. Adding default value for 'x_backend_type'
and 'x_api_protocol' options. Minor code optimization for
finding array iSCSI addresses.

Here 'x' stands for dothill or hpmsa or lenovo.

DocImpact
Change-Id: I7a5924bbd56053aee6d652842b48e913c54ae7dd
Closes-Bug: #1486160
Co-Authored-By: Lakshman <lakshminarayanat@vedams.com>
Co-Authored-By: Chris Maio <chris.maio@dothill.com>