fwd: Move port exclusion handling from procfs_scan_listen() to callers

To avoid forwarding loops, we need to exclude certain ports from being
auto-forwarded.  To accomplish this, procfs_scan_listen() takes a bitmap
of exclusions.  As it detects each port, it checks against that bitmap.
This is a complicated way of accomplishing what we need.  We can instead
mask out the excluded ports in the callers using a new bitmap_and_not()
helper.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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