HMaster cleanup and refactor
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Key: HBASE-2695
URL: https://issues.apache.org/jira/browse/HBASE-2695
Project: HBase
Issue Type: Sub-task
Components: master
Reporter: Jonathan Gray
Priority: Critical
Fix For: 0.21.0
Before doing the more significant changes to HMaster, it would benefit greatly
from some cleanup, commenting, and a bit of refactoring.
One motivation is to nail down the initialization flow and comment each step.
Another is to add a couple new classes to break up functionality into helpers
to reduce HMaster size (for example, pushing all filesystem operations into
their own class). And lastly to stop the practice of passing around references
to HMaster everywhere and instead pass along only what is necessary.
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