Bump src/hm9000

HM9000 is not longer a singleton

Bump cloudfoundry/hm-workspace:
  Onsi Fakhouri:
     more work on travis flakiness ( Travis Success: https://travis-ci.org/cloudfoundry/hm-workspace/builds/15554612 )
     make tests less flakey? ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/15554067 )
     Merge branch 'master' of https://github.com/cloudfoundry/hm-workspace ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/15541773 )
     HM9000 is no longer a singleton ( Travis Unknown )
     fix null json array issue, bump testing framework ( Travis Success: https://travis-ci.org/cloudfoundry/hm-workspace/builds/15410765 )