Add: Use containers for shared TG

+ Ansible
  + Service for auto load during restart
  + By default created 2 instances of Docker container
+ Small modification of Trex to use prefixes
+ DNV topology to use ssh port to connect to docker

Signed-off-by: Peter Mikus <pmikus@cisco.com>
Change-Id: Ibc2b2f0e509d920fc3e05d012b88abc388f5c3e7
(cherry picked from commit 96eaabff284f154ca96ce823fee205bd9833043b)