Improved argument parsing for the eurephia-auth arguments passed from the config file.

Using getopt_long(...) to handle arguments.  The following options are available:

	[--log-destination | -l] {<filename> | openvpn: | none: }
		If openvpn: is given, all errors will be written to stderr which
		OpenVPN then will take care for getting logged
		If none: is given, no logging will happen in eurephia-auth
		In all other cases, a file with the given name will be opened
		and all logs will go here.

		If no --log-destination is given, it will let openvpn do the
		logging.

	[--log-level | -L ] <log level>
		Sets log thresold level

	[--database-interface | -i] <database driver>
		Tells eurephia-auth which database driver (.so) file to load for
		database handling

After these options, a '--' (double ones!) should be given, at least to clarify
that we are done with arguments for eurephia-auth.  All arguments after '--' will
be sent directly and unparsed further to the database module.  The database module
can then use it's own argument parsing.

For the eurephiadb-sqlite.so, it takes only one parameter - database file.

OpenVPN config example:
plugin /etc/openvpn/eurephia/eurephia-auth.so --log-destination /var/log/eurephia-auth.log --log-level 2 --database-interface /etc/openvpn/eurephia/eurephiadb-sqlite.so -- /etc/openvpn/eurephia/eurephiadb

Or a shorter version would be:
plugin /etc/openvpn/eurephia/eurephia-auth.so -l /var/log/eurephia-auth.log -L 2 -i /etc/openvpn/eurephia/eurephiadb-sqlite.so -- /etc/openvpn/eurephia/eurephiadb

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