Start metrics system even if config files are missing
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Key: HADOOP-7306
URL: https://issues.apache.org/jira/browse/HADOOP-7306
Project: Hadoop Common
Issue Type: Improvement
Components: metrics
Affects Versions: 0.23.0
Reporter: Luke Lu
Assignee: Luke Lu
Fix For: 0.23.0
Per experience and discussion with HDFS-1922, it seems preferable to treat
missing metrics config file as empty/default config, which is more compatible
with metrics v1 behavior (the MBeans are always registered.)
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