Disable EKF that's not necessary (unless robot moves)

[130s]

Reported at start-jsk/rtmros_common#852

EKF is not necessary for Hiro nor NEXTAGE, unless they have custom mobile capability. So

• turn it off by default
• users can optionally set it true via arg

[130s]

One of 3 travis cases failed. https://travis-ci.org/start-jsk/rtmros_hironx/jobs/87878727#L374-L375

$ if [ $USE_DEB == false ]; then $ROSWS update   ; fi
ERROR in config: scm type without declared uri in {'local-name': 'rtm-ros-robotics/rtmros_hironx', 'version': 'indigo-devel'}

Merging based on the same reasoning as #401 (comment).