ENG-12094: Add log message when restarting database with no command log.
ENG-12094: Add log message when restarting database with no command log.

If there is no command log or snapshot data to recover from when
restarting the database, print an INFO level message to the log file and
the console indicating that the database will start empty.

deerwalk/voltdb,VoltDB/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,VoltDB/voltdb,deerwalk/voltdb,deerwalk/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,deerwalk/voltdb,deerwalk/voltdb,VoltDB/voltdb,simonzhangsm/voltdb