This renames the log files in logs/screen that contain timestamps to put
the timestamp after '.log' and '.log.summary' in the names. This will
simplify devstack-gate's search for log files to copy to '*.log'.
dstat.txt is also renamed to dstat.log
Make LOGDIR and LOGFILE local
bp:devstack-logging-and-service-names
Change-Id: I02aba9ca82c117a1186dafc1d3c07aa04ecd1dde