Bump src/hm9000

Bump cloudfoundry/hm-workspace:
  Eric Malm and Onsi Fakhouri:
     switch the CF fork of etcd for now, remove zookeeper and cassandra from travis builds ( Travis Success: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13385206 )
     reorganized cassandra ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13384278 )
     fell victim to go's insufferable pedantry ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13378730 )
     removed store logging (but really just want to see travis pass again) ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13378400 )
     Added long timeout to cassandra ( Travis Success: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13377847 )
     performance improvements to cassandra ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13376860 )
     improved performance of cassandra reset ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13342767 )
     dare we say... victory? ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13341746 )
     once more, unto the breach ( Travis finished: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13341448 )
     trying to debug cassandra in travis ( Travis finished: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13341063 )
     really didn't expect that to work the first time anyway... ( Travis finished: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13340571 )
     added cassandra as a database store ( Travis finished: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13340383 )
add missing src file group to hm9000 spec