bugfix: linux kernel-like ratelimiter did not work properly with all inputs

(for example, it did not work with imdup). The reason was that
the PRI value was used, but that needed parsing of the message, which
was done too late.
Merge branch 'v7-stable' into v7-devel

Conflicts:
	plugins/imudp/imudp.c
Merge branch 'v7-devel'