Willy Tarreau d465610ec3 MEDIUM: trace: implement a "follow" mechanism
With "follow" from one source to another, it becomes possible for a
source to automatically follow another source's tracked pointer. The
best example is the session:
  - the "session" source is enabled and has a "lockon session"
    -> its lockon_ptr is equal to the session when valid
  - other sources (h1,h2,h3 etc) are configured for "follow session"
    and will then automatically check if session's lockon_ptr matches
    its own session, in which case tracing will be enabled for that
    trace (no state change).

It's not necessary to start/pause/stop traces when using this, only
"follow" followed by a source with lockon enabled is needed. Some
combinations might work better than others. At the moment the session
is almost never known from the backend, but this may improve.

The meta-source "all" is supported for the follower so that all sources
will follow the tracked one.
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