mos: watson://... RPC call support URIs should be of the following format: watson://org-or-host/devtype/devid org-or-host is either org id or full messaging host name, i.e. it can be myorg or myorg.messaging.internetofthings.ibmcloud.com API key and auth token can be provided as user:password component of the URI: watson://a-myorg-4svdriwzyr:AAA%28-BBBCCDEFFRWD@myorg/mos/esp8266_123456 Note that special symbols in the token, if present, must be URL-encoded. API key and token can be supplied via command line or environment as well: `--watson-api-key` / `MOS_WATSON_API_KEY` and `--watson-api-auth-token` / `MOS_WATSON_API_AUTH_TOKEN` respectively. Includes minor fixes to rpc-mqtt. CL: mos: watson://... RPC call support PUBLISHED_FROM=b0a5566b74ba55b83be6a4490b62b93c825c1a97