Merge branch 'stable-2.8' into stable-2.9

* stable-2.8:
  Fix typo in REST API example for /test.submit_rule
  Documentation: mention that index.commitWithin uses time units
  Access-control: Administrators no longer have all capabilities by default
  Access-control: Specifying what is meant by ssh access

Conflicts:
	Documentation/access-control.txt

Change-Id: I2c73bec4c0d1521ca6640b06b148026b2daed251