Log caught exceptions in server installer at debug level
exception() is a helper that logs a traceback at the ERROR
level. Since the stdout logs at INFO the traceback was going to
both the log file and stdout. We really only want it in the debug
log.
https://fedorahosted.org/ipsilon/ticket/143
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>