Find test codes in irteus/test directory to reduce description in .travis.yml

Find test codes in irteus/test directory to reduce description in .travis.yml according to the discussion[1]
Currently unittest.l is neglected. 
It does not work because of invalid exit code[2] or testing of intentional failure[3].

[1] https://github.com/euslisp/jskeus/commit/83432a3d75c950481e9f3079b077f47f73c1059dp
[2] euslisp/EusLisp#19
[3] jsk-ros-pkg/jsk_roseus#21 (comment)