Added 'decode()' to template string from marathon 'decribe()' call.
Added 'decode()' to template string from marathon 'decribe()' call.

Without this decoding, the stream of bytes returned from the marathon
describe call were being interpreted as a 'collection.Sequence' in the
subsequent 'emitter.publish()' call. This was causing the subesequnt
JSON encoding to blow up since it was interpeting it as the wrong type.

dcos/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,mesosphere/dcos-cli,mesosphere/dcos-cli,dcos/dcos-cli,mesosphere/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli