Change init script to interact with xapi better at boot.

Change init script to interact with xapi better at boot.

It seems that with a controller specified in vswitchd, previously
there was a bad interaction between vswitchd and xapi during boot that
prevented the management interface from ever coming up.  The solution
here is to force all bridge interfaces up when vswitchd starts, so
they are already up when xapi attempts to bring them up.  Since the
interfaces are coming up earlier as a result, we move vswitch back in
the boot sequence after iptables starts.

This patch also contains a bunch of lines that have only changed in
whitespace because half the indentation in this file was done using
tabs and the other half was done with spaces...