wecharyu opened a new pull request, #4257:
URL: https://github.com/apache/hive/pull/4257
### What changes were proposed in this pull request?
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1. make `HMSHandler` Proxy configurable by new metastore conf
**"metastore.hmshandler.proxy"**
2. provide `AbstractHMSHandlerProxy` to extend customized handler
3. clean some hacked test codes in `HMSHandler`
### Why are the changes needed?
1. make the handler of metastore flexible to config and extend
2. improve the code of `HMSHandler`
### Does this PR introduce _any_ user-facing change?
Yes, user can use new conf and api to extend their own handler.
### How was this patch tested?
Passing all existing tests.
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