FreeBSD/src d090e21 (r349961)usr.sbin/bhyve pci_passthru.c mevent.c

MFC 343068:
Use capsicum_helpers(3) that allow us to simplify the code and its functions
will return success when the kernel is built without support of
the capability mode.

It is important to note, that I'm taking a more conservative approach
with these changes and it will be done in small steps.
DeltaFile
+8-5usr.sbin/bhyve/pci_passthru.c
+6-3usr.sbin/bhyve/mevent.c
+5-4usr.sbin/bhyve/consport.c
+3-5usr.sbin/bhyve/uart_emul.c
+2-5usr.sbin/bhyve/bhyverun.c
+5-2usr.sbin/bhyve/block_if.c
+4-1usr.sbin/bhyve/pci_virtio_net.c
+4-1usr.sbin/bhyve/dbgport.c
+4-1usr.sbin/bhyve/pci_virtio_console.c
+4-1usr.sbin/bhyve/pci_e82545.c
+4-1usr.sbin/bhyve/pci_virtio_rnd.c
+4-1usr.sbin/bhyve/rfb.c
+2-2usr.sbin/bhyve/gdb.c
+55-3213 files

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