* Add support for web based grpc
* Avoid panic in observatory command: incorrect tag
* Add WebCommander app for web based client
* Add WebCommander app for web based client
* Add urlline subscription container format support
* avoid panic when serving user request
* refine subscription info api
* fix start consistency issue in web commander
* fix webcommander import style
* fix urlline parsing
* fix crash in subscription commander
* add webroot file serving at webcommmander
* fix crash when observatory is not found
* add autogenerated subscriptionmgr err
