Add new metrics unit tests.
----------------------------
Key: HDFS-907
URL: https://issues.apache.org/jira/browse/HDFS-907
Project: Hadoop HDFS
Issue Type: Test
Components: name-node
Environment: This jira will add more Unit tests for metrics reported
by NameNode e.g - numGetBlockLocations .
Reporter: Ravi Phulari
Assignee: Ravi Phulari-- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
