Implement minimal --disable-relay-mode

Add:

• --disable-relay-mode
  • Build tor with relay mode disabled: tor can not run as a relay, bridge, or authority. Implies --disable-dirauth-mode.
  • disable DirPort, DirCache, ORPort, and sets ClientOnly to 1
  • pick one quick module/function to disable

Update:

• --disable-dirauth-mode
  • hidden alias --disable-module-dirauth
  • Build tor with authority mode disabled: tor can not run as a directory authority or bridge authority.