fix unittest_gtest to run after vnum
fix unittest_gtest to run after vnum

jubatus/jubatus,roselleebarle04/jubatus,rimms/jubatus,Asuka52/jubatus,elkingtonmcb/jubatus,gintenlabo/jubatus,rimms/jubatus,jubatus/jubatus,elkingtonmcb/jubatus,mathn/jubatus,kmaehashi/jubatus,jubatus/jubatus,kmaehashi/jubatus,roselleebarle04/jubatus,gintenlabo/jubatus,mathn/jubatus,Asuka52/jubatus