Fix regression server to adapt new mixable
Fix regression server to adapt new mixable

kumagi/jubatus_core,kumagi/jubatus_core,kmaehashi/jubatus_core,kmaehashi/jubatus_core,gintenlabo/jubatus_core,rimms/jubatus_core,gintenlabo/jubatus_core,kmaehashi/jubatus_core,rimms/jubatus_core,gintenlabo/jubatus_core,rimms/jubatus_core,gintenlabo/jubatus_core,kumagi/jubatus_core,rimms/jubatus_core,kumagi/jubatus_core,kmaehashi/jubatus_core