This commit updates all authorship and copyright information to include a
standard header that references the AUTHORS and CREDITS file. This standard
header was written by the Debian legal team at the request of Franck Joncourt.
The client --test mode decrypts SPA packet data as a final step, but get_keys()
was being called to re-acquire the encryption/HMAC keys. This commit reuses
the same keys that were supplied for SPA packet encryption/authentication
because the most important code to test is not get_keys() but rather libfko
encryption/decryption/authentication operations.
Changed PID string length to 7 to accomodate an ending newline and NULL
char when writing to the fwknopd .pid file. Without this fix, with a
5 digit PID the trailing newline would be truncated (no room for the
ending NULL char).
