logging: T2186: Initial implementation of logging

All messages sent to stderr are now logged to syslog.

Also should a raise statement not be handled by the program,
a friendlier message is sent to the user (with the trace to
syslog)

It provide a new debug option: /tmp/vyos.developer.debug
when the file exists and the code raise without being caught up
the program will automatically fall into pdb port-morterm mode
allowing to investigate the reason for the failure

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