ofproto: Initialize ports immediately upon ofproto creation.

ofproto: Initialize ports immediately upon ofproto creation.

I don't see why we should delay initializing the ports to the first call
of ofproto_run1().  We originally did initialize the ports in
ofproto_create(), but back in January 2010 Jesse moved the call into
ofproto_run1() in commit 149f577a "netdev: Fully handle netdev lifecycle
through refcounting."  The commit message doesn't explain why this
particular change was made, so I can only assume that it was important at
the time.  Now, however, everything seems to work fine with initialization
done in the most logical place.