RFR: Log rotation

[cfumiwu]

Making the shenandoah log file be able to rotate with given log file count and log file size. Default log file count would be 5 and default log file size would be 20MB.

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Commit messages:
 - Syncing the file with the local changes
 - Exit JVM when initialization failed
 - Adding assertion error when _stream is NULL
 - Terminate process when initailization fails
 - Prints error message when _stream is NULL and change description for command line options
 - Adding new log rotation test case and delete unused variables
 - Create log rotation for shenandoah log files

Changes: https://git.openjdk.org/shenandoah/pull/158/files
 Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=158&range=00
  Stats: 320 lines in 6 files changed: 309 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/shenandoah/pull/158.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/158/head:pull/158

PR: https://git.openjdk.org/shenandoah/pull/158