BEE Backport regress/scripts/setup

BEE Backport regress/scripts/setup

This commit is the result of the squash of the following main commits:

Author: Radoslaw Korzeniewski <radekk@inteos.pl>
Date:   Mon Apr 16 16:35:23 2018 +0200

    Fix 'grep -m' when '-m' option is not available.

Author: Radosław Korzeniewski <radekk@inteos.pl>
Date:   Tue Jan 2 13:49:35 2018 +0100

    regress: Add scripts for XenServer Plugin

    regress: Fix for script for XenServer Plugin

    regress: Fix syntax error in regression script

    regress: Corrections to the regression scripts.

    regress: More fixes to the regression test scripts for XenServer Plugin.