Create a static method in log-test-base.h to append NO_OPs to the log synchronously
Create a static method in log-test-base.h to append NO_OPs to the log synchronously

This adds a method to add NO_OPs synchronously to log-test-base.h so that we can
reuse this in muliple places.

Change-Id: I7bb41fbfb2540031a4533fc5aadc1811d22da07b
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5270
Tested-by: jenkins
Reviewed-by: Michael Percy <e07a1fd797b473a9c849e618aa2ce06d8055760b@cloudera.com>

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