LTD: Expand requirements of Soak/Long Duration Tests

LTD: Expand requirements of Soak/Long Duration Tests

In Project discussion on Jan 17, 2018 including review of RFC 8204,
we identified the following five areas to improve the Soak tests.
See the JIRA ticket for details.

JIRA: VSPERF-557

Change-Id: I5314c283a383c57d99863fcf7262c4f28e1c12a8
Signed-off-by: Al Morton <acmorton@att.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>
Reviewed-by: Trevor Cooper <trevor.cooper@intel.com>
Reviewed-by: Richard Elias <richardx.elias@intel.com>