use start_omninames.sh for rosdevel build environment, see #400
rtmbuild: install test directory so that others can uses this
fix for installed test, use rtmbuild_SOURCE_PREFIX to check if devel/src environment
fix to work on rosbuild
Merge pull request #401 from k-okada/400_start_omninames_for_test

use start_omninames.sh for ros build firm environment, see #400