Since Tor 0.2.9 has been unsupported since January, 0.3.5 is the
oldest supported version, and its features constitute the oldest
recommended feature-set.

This patch updates these recommendations:

   DirCache=2

      Support for consensus diffs.
      New in 0.3.1.1-alpha.

   HSDir=2

      Support for v3 onion service descriptors.
      New in 0.3.0.4-alpha.

   HSIntro=4

      Support for Ed25519 intropoint authentication keys.
      New in 0.3.0-4-alpha.

   HSRend=2

      Support for rendezvous cells longer than 20 bytes.
      New in 0.2.9.4-alpha.

   Link=5

      Link padding and link padding negotiation.
      New in 0.3.3.2-alpha.

   LinkAuth=3

       Ed25519 link authentication.
       New in 0.3.0.1-alpha.

"ours" to avoid version bump.

"ours" to avoid version bump.

Closes ticket 34446.

Signed-off-by: David Goulet <dgoulet@torproject.org>

Co-authored-by: Florentin Rochet <florentin.rochet@uclouvain.be>

Co-authored-by: Florentin Rochet <florentin.rochet@uclouvain.be>

Co-authored-by: Florentin Rochet <florentin.rochet@uclouvain.be>

Co-authored-by: Florentin Rochet <florentin.rochet@uclouvain.be>

Co-authored-by: Florentin Rochet <florentin.rochet@uclouvain.be>

This tracking of the instantiation count should eliminate race conditions due
to starting and stopping machines rapidly. Now, we should no longer obey
STOP commands for previous machines.

("Ours" to avoid removal of .enable_practracker_in_hooks)