Pull statistics and tracking code out of circuitbuild.c

Circuit build timeout logic and path bias tracking is functionally separable from the rest of what circuitbuild.c does ; we can pull it out and put it in a new guardnodes.c or entrynodes.c module.

(Not doing this yet since the pending legacy/trac#6465 (moved) touches circuitbuild.c)

changed milestone to %Tor: 0.2.4.x-final in legacy/trac

added component::core tor/tor in Legacy / Trac milestone::Tor: 0.2.4.x-final in Legacy / Trac parent::6837 in Legacy / Trac priority::medium in Legacy / Trac resolution::fixed in Legacy / Trac status::closed in Legacy / Trac tor-client in Legacy / Trac type::defect in Legacy / Trac labels

Trac:
Keywords: N/A deleted, tor-client added

Trac:
Component: Tor Client to Tor

I pulled a ~1500 line chunk of circuitbuild.c out into circuitstats.c in branch "split_circuitbuild". Could use a review.

This branch didn't split out the path bias code yet. I'd argue for giving that its own file.

That branch also includes the split in legacy/trac#6838 (moved) . With those two, circuitbuild.c is now less than half its original size.

Trac:
Status: new to needs_review

Oh hey, looks like I merged this in 0.2.4.5-alpha. Closing this ticket.

Trac:
Status: needs_review to closed
Resolution: N/A to fixed

closed

moved from legacy/trac#6839 (moved)

added Bug label and removed 1 deleted label

added Client label and removed 1 deleted label