skinny: improve cleanup of devices during registration and unregistration, resolves some weird state issues when devices get disconnected

Revert "FS-5567 --resolve add a non-error level informational log message when no files match pattern"

This reverts commit 79d23ec0.

pulling this one for a bit...

This reverts commit 518b5a80.

Keeping parameter handling quirks for backwards compatibility reasons.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Fixes GCC format string warning/error.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

FS-5445 --resolve this was actually just missing one word from the code as seen in the similar code in the core, the same mistake was made there where the compiler is not smart enough to see the mutually exclusive logical paths this code is specific to spontaneously creating an array in a single set like set foo[12]=val which would be totally broken if that line were commented