Be more consistant in using perl vs. perl5. We were using perl5 in the
kernel builds so as not to confuse with perl4 when bootstrapping from old
systems. I don't know if this is still applicable but it shouldn't hurt
to be consistant at least.

Also copy vnode_if.sh to vnode_if.pl. Doing a 'sh vnode_if.sh' when it
was a perl script was kinda silly.