tests: kern: improve logsigexit test

Use dmesg(8) instead rather than relying on a particular syslogd
configuration, and just skip the test if we can't access the msgbuf.

While we're here, remove s

tests: kern: improve logsigexit test

Use dmesg(8) instead rather than relying on a particular syslogd
configuration, and just skip the test if we can't access the msgbuf.

While we're here, remove some debugging output that we don't actually
need.

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tests: kern: add some tests for recently added logsigexit

We don't bother tweaking the sysctl in these tests, we'll just try with
it forced both on and off via proccontrol(1). This could be problem

tests: kern: add some tests for recently added logsigexit

We don't bother tweaking the sysctl in these tests, we'll just try with
it forced both on and off via proccontrol(1). This could be problematic
in the face of pid wrapping if we got really unfortunate, but the
potential solutions need careful consideration- you probably don't want
to assume a certain velocity of messages into syslog, so just checking
the last N lines is probably similarly flakey.

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