Provision wp-cli and phpcs into /tools instead of /www

They're both system tools rather than web applications, so it doesn't make sense to put them in the www folder. /www should be reserved for document root folders for virtual hosts.
Move vvv-hosts to config/init.

It's a config file, so I'd rather it live in the config directory. It was probably there because some people put additional vvv-hosts files in their various document root folders under /www, but I don't do that, so this works for me.
Move vvv-init.sh to /provision