Add the init.d service script for opentsdb RPM.

- Added the init.d service script for opentsdb.
- Makes opentsdb logs roll hourly.
  Configures the existing logback.xml with the RollingFileAppender class.
  Changes the init script to supply the log file prefix with the right
  directory and host name.
- Auto-restart on OOM & allow JVM args to be configured.
- Updated init to be smarter and use redhat init functions
- Added timestamp to RPM filename.

NOTE: Submitted on behalf of third-party contributors:
 * Kimoon Kim <kimoon@pepperdata.com>
 * Sean Suchter <ssuchter@pepperdata.com>
 * tthompso <tthompso@linkedin.com>