modprobe: don't check refcount with remove command

modprobe: don't check refcount with remove command

The modprobe.d (5) documentation for the "install" command
states that you could specify

install fred /sbin/modprobe barney; /sbin/modprobe --ignore-install fred

This makes some sense, but then the loading of "barney" is
hidden from the user who did only "modprobe fred". Thus,
it seems it should be possible to be able to unload the
"fred" module with "modprobe -r fred" by configuring the
"barney" module to also be removed:

remove fred /sbin/rmmod barney fred

(or similar.)

Make this possible by not checking the refcount when an
unload command was configured.

Reported-by: David Spinadel <david.spinadel@intel.com>