EHN:Improve how log files are handled

Log file in InitFileLogging is now set to use TimedRotatingHandler, the file
will rotate based on 1 hour interval and keep up to 10 backups.

Also rename VISTA.log to VistAInteraction.log and append timestamp in
"%Y-%m-%d_%H-%M-%S" format, the new log file name will look like
"VistAInteraction.log.2013-01-22_14-48-42".

OSEHRA-Id: http://issues.osehra.org/browse/VAF-71
Change-Id: I454e7cf0ffac2640456259dc3818cded4d03300b
Merge "EHN:Improve how log files are handled"