sysutils/runit-faster: Update scripts to 0.1.18

• Add svclone script for creating copies of services, adding/updating supervise symlinks, etc.
• Stop resetting the current runlevel to the default on every update
• When /var/service already exists on the system make sure to try and update it on install and not just create a symlink under it
• With ROOT=on be more conservative with what's installed into /sbin, just enough to bootstrap the system until /usr/local is mounted