bugfix: Fix errors related to removal of kernel modules

bugfix: Fix errors related to removal of kernel modules

Internal module manager is responsible for removal of all vsperf
specific kernel modules. Order of modules has been changed
to respect possible dependencies among modules. Manager has been
improved to detect modules automatically loaded by modprobe
to solve dependecies. These modules are automatically removed.
Code of module manager has been refactored.

Change-Id: I4484f3bea7d9900db688f96edd5c3c6d4a304742
JIRA: VSPERF-259
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Brian Castelli <brian.castelli@spirent.com>