experimental: support for systemd-induced second PRI in klog

if systemd writes a kernel log entry with a non-kernel priority,
the priority recorded in the kernel log will be wrong. However,
it will be immediately followed by another priority (with the
kernel timestamp in between, if enabled). So imklog now tries
to see if there is a second PRI and, if so, uses it. Note that
we already support non-kernel PRIs in the kernel log, as this
was done in BSD for quite some while. HOWEVER the config
statement "$klogpermitnonkernelfacility on" must be used to
permit this (otherwise non kernel messages are dropped).
Sample of a such a message on a kernel without timestamping
enabled:

$ echo '<14>text' > /dev/kmsg
$ dmesg -r
<4><14>text

NOTE: support for timestamp is NOT YET ENABLED!

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