OpenTSDB: Support non-root user running OpenTSDB. (https://rbcommons.com/s/pepperdata/r/3527)
The last piece to support non-root user running OpenTSDB was that non-root
OpenTSDB daemon should be able to restart itself by running
/usr/share/opentsdb/opentsdb_restart.py. - Changed the owner of pid, lock, log
files and the log directory to the specified USER at /etc/sysconfig/opentsdb. -
Fixed the default restart script path.  *** Users should change the permission
of the cache directory. In this case, the failure log messages go to OpenTSDB
log files.