Make mv work better with SELinux.

[Daniel J Walsh]

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One of if not the most common problem people hit with SELinux is the mv
command, which maintains the file context of the source destination.

mv /home/dwalsh/index.html /var/www/html/

This blows up on everybody and then the users have no idea why.

I was thinking about adding -Z (--restorecon) to mv and having it basically do a
internal restorecon on the destination.

Then we could suggest people who get burnt by this to:

alias mv="mv -Z"

In Fedora 18 we have greatly enhanced matchpathcon, by pre-compiling the
regex, so there should be very little slow down in doing this.

I will work on the patch, if people agree with the idea.
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