add configuration support for BK
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Key: BOOKKEEPER-108
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-108
Project: Bookkeeper
Issue Type: Improvement
Affects Versions: 3.4.0
Reporter: Sijie Guo
Fix For: 4.0.0
As Ivan's comment on BOOKKEEPER-39, we use lots of system properties in BK now.
It's better to use a proper configuration object to manager them.
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