New test failures on port-amd64

[Paul Goyette <paul%whooppee.com@localhost>]

Recently, several dev/sysmon/t_swsensor tests started to fail, with the 
following errors:

WARNING: module error: builtin module `zfs' failed to init
WARNING: ZFS on NetBSD is under development
panic: kernel diagnostic assertion "kc_initialised" failed: file 
"/test-bed/src/lib/librump/../../sys/rump/../kern/subr_kcpuset.c", line 225
rump kernel halting...
halted

While it may or may not be related, these failures started at the same 
time as the addition of librumpnet_npf




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