docs: adding license to rest of rst files

docs: adding license to rest of rst files

Add Creative Commons Creative Commons license to missed documentation
in vsperf. One of these files is not on the stable Brahmaputra branch.
JIRA: VSPERF-239

Change-Id: If1420c3b84ba5ba9e1b4c1f9d75347f1b6e6117f
Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Billy O Mahony <billy.o.mahony@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Brian Castelli <brian.castelli@spirent.com>