config: fold back config-file parsing into command line parsing
This undoes part of the strangeness we had in configuration files. Now
"-f" is recognized on the command line, and more than one file can be
specified. Only if no file is found, the default one is used
(wr-switch looks in /wrc/etc/ppsi.conf first).
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
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