refine merge process. change test port from 4000 to 4123 to avoid port confliction with nomachine daemon.
Merge pull request #142 from whjiang/merge-process

refine merge process. change test port from 4000 to 4123 to avoid port c...
make travis run unit test
Merge pull request #143 from whjiang/travis-ci

make travis run unit test
add Master, ClockService UT and minor bug fix
Merge pull request #144 from huafengw/test

add Master, ClockService UT and minor bug fix