Introduce smoke tests for FDS

Introduce smoke tests for FDS

Added:
 - fds repository to docker file
 - fds test to smoke tier in testcases
 - config values for fds tests

A new robot var OS_AUTH_URL is defined as expected by FDS robot files.
Method args switch from Keystone IP to OS_AUTH_URL which is more
precised. The argument parsing is changed too.

Co-Authored-By: Cédric Ollivier <cedric.ollivier@orange.com>
Change-Id: Ife27ab4a83f0110cbdcf7c9d47d9b3fb4c0ec705
Signed-off-by: Tomas Cechvala <tcechval@cisco.com>
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>