Log Message:
Use PKG_SYSCONF* variables correctly in net/knot.

Set PKG_SYSCONFSUBDIR to "knot" to have all of the config files
located in the "knot" subdirectory of ${PKG_SYSCONFBASE}.

Pass ${PKG_SYSCONFBASE} to the configure script since the package's
build infrastructure automatically appends "/knot" to the value
passed in through --sysconfdir.

Remove ${PKG_SYSCONFDIR} from INSTALLATION_DIRS since it is
automatically created by the package install script.

Bump the PKGREVISION due to changes in the package install scripts.