Update HBase metrics framework to metrics2 framework
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Key: HBASE-4050
URL: https://issues.apache.org/jira/browse/HBASE-4050
Project: HBase
Issue Type: New Feature
Components: metrics
Affects Versions: 0.90.4, 0.92.0
Environment: Java 6
Reporter: Eric Yang
Metrics Framework has been marked deprecated in Hadoop 0.20.203+ and 0.22+, and
it might get removed in future Hadoop release. Hence, HBase needs to revise
the dependency of MetricsContext to use Metrics2 framework.
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