Bump src/cloud_controller_ng, src/dea_next

Bump cloudfoundry/cloud_controller_ng:
  Maria Shaldibina:
     Refactor DEA placement. ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/14508469 )
  liurui-1:
     Add HA enhancement with simple availability zone algorism ( Travis Unknown )
Bump cloudfoundry/dea_ng:
  Maria Shaldibina:
     Ignore the buildpack when detection script fails. ( Travis started: https://travis-ci.org/cloudfoundry/dea_ng/builds/14520552 )
  liurui:
     Refine the placement_properties of DEA for HA enhancement ( Travis Unknown )
  liurui-1:
     Add HA enhancement with new "placement_properties" of DEA ( Travis Unknown )

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>