Regression in pciconf utility in releng/11.0

[David Boyd]

pciconf -lv em0 at pci0:6:0:0: returns the following error:

	pciconf: cannont parse selector em0:pci0:6:0:0:

This is contrary to the man page documentation which specifies that the
trailing colon is optional and ignored.

I have verified that this worked properly (as documented) in
releng/10.3.

A diff of pciconf.c between releng/11.0 and releng/10.3 show that the
"parsesel" function received a major rewrite.

Thanks.

If I should submit a PR, just let me know.