Updated logging and integrate with Geoff's config files

[zelin-l]

Changes (both web6 & yudien):

• Integrated with Geoff's config update (logging & admin user will now pull from config file)
• Changed a lot of log.Fatal to log.Panic to prevent crashing in production when not critical
• Changed a lot of UdnLog to UdnLogLevel to better integrate with config file. log_trace is be used for a lot of the most basic UDN function