packages/fff: Split fff-hoods into two packages

Code which is reused by other functionalities is put into the
fff-hoodutils package, so it can be used without including
configurehood.

This also allows setting missing dependencies of other packages.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Tim Niemeyer <tim@tn-x.org>