Move SVN checkout to vip-init script

Using Puppet to checkout WordPress trunk from the VM will
create conflicts if the SVN versions are different. We can
just checkout WordPress from the host machine by moving
it to the vip-init script.

Also moving the shared plugins checkout from right after
VM provisioning to right before. Not really any reason other
than it seems cleaner to have SVN checkout happening together
and we need WP before we can provision