use consul for file server discovery

[delivers #76320482]

Submodule src/github.com/cloudfoundry-incubator/converger f90d3cc..71a1e45:
  > do not replace placeholder fileserver URL anymore [#76320482]
Submodule src/github.com/cloudfoundry-incubator/file-server fe1bbea..5ae3a27:
  > file server no longer announces its heartbeat to ETCD [#76320482]
Submodule src/github.com/cloudfoundry-incubator/inigo 1ef44a8..361b95b:
  > update inigo command line params to account for file server discovery via consul [#76320482]
  > Rename inigo_server and its endpoints/methods
Submodule src/github.com/cloudfoundry-incubator/nsync c9235c8..3b048d8:
  > use consul DNS for file server discovery instead of placeholder [#76320482]
Submodule src/github.com/cloudfoundry-incubator/runtime-metrics-server c1680db..63bc3a6:
  > remove file server service registrations (now handled via Consul) [#76320482]
Submodule src/github.com/cloudfoundry-incubator/runtime-schema 286f859..c3dc422:
  > remove file server service discovery via BBS [#76320482]
  > Add DesireLRP to ReceptorBBS
Submodule src/github.com/cloudfoundry-incubator/stager 07aee6a..afaac54:
  > use consul DNS for file server discovery instead of BBS [#76320482]

Signed-off-by: Nick Wade <nwade@pivotal.io>