For EPEL - Consolidate mounting code

[DrDaveD]

Description of the Pull Request (PR):

This PR consolidates the mounting code, based on the release-2.6 branch. It is not expected to be merged, but to be the basis of an EPEL/Fedora patch. Replaces PR #1624

This fixes or addresses the following GitHub issues:

• Ref: #

Checkoff for all PRs:

• I have read the Guidelines for Contributing, and this PR conforms to the stated requirements.
• I have added changes to the CHANGELOG and and documentation updates to the singularityware documentation base.
• I have tested this PR locally with a make test
• This PR is NOT against the project's master branch
• I have added myself as a contributor to the contributors's file
• This PR is ready for review and/or merge