- Fixes #231: when resource name is too long in resource page, the name will jump out and cover other layout
- Hide `origin` input view in degrade rule dialog
- Refine style and color of buttons in dialogs
- Add support for exception count in degrade rule
- Other improvements

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Decouple rule checking from controller (now in service)

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

normalize metric fields and methods:
- rename exception to exceptionQps;
- remove ed postfix of all fields and methods about metrics;