Functest Config Guide - Text updates to reflect new CLI

Functest Config Guide - Text updates to reflect new CLI

Text updates to reflect the introduction of the Functest CLI for
Functest docker container environment.
Some additional tips added for operations behind http proxy
In addition directory structure change relected in text

Patch 2 : Incorporating almost all review comments from
          Jose and Morgan
Patch 3 : Obliterating infernal trailing white space for good!
Patch 4 : Incorporating further comments/advice from Jose,
          Morgan and Juha Haapavirta.
Patch 5 : feature selection odl --> odl_l2 | odl_l3
          CI_DEBUG also send Trace texts to standard console

FUNTEST-238

Change-Id: Ic9063cff6e8db2ec457cda4c5c3e6f8b0a1c36b2
Signed-off-by: columgaynor <colum.gaynor@nokia.com>