wu-sheng opened a new issue #1047: Refactor the collector configuration 
URL: https://github.com/apache/incubator-skywalking/issues/1047
   Please answer these questions before submitting your issue.
   - Why do you submit this issue?
   - [ ] Question or discussion
   - [ ] Bug
   - [ ] Requirement
   - [x] Feature or performance improvement
   ### Requirement or improvement
   - Please describe about your requirements or improvement suggestions.
   Right now, the collector configuration initialization is based on properties 
from yaml, which is cool, but the type of each setting is based on yaml config 
too. And this cause some problems when I want to override some setting from 
system properties. In order not to trigger type cast exception, we have to set 
the default value in yaml, but expected to override, which is very weird.
   The second problem of current mechanism is we are using a lot of `x_y_z` in 
yaml, which is good if only yaml considered. But when we want to override from 
system env (failed before), we can't find the proper char to separate 
`module#provider#settingKey`. In system env, `_` is a tradition, so we need 
remove all `_` in existed settings, and forbid that in the future. 
   I think if we use Setting-Object mapping mechanism would helps. Create an 
object and individual class for each provider, all fields use CamelCase naming 
and type sensitive .

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