replace bwconnrate/burst consensus params with new names
#1830 (moved) (fixed in 0.2.2.15-alpha) addressed a bug in how relays running Tor 0.2.2.7-alpha through 0.2.2.14-alpha handle the bwconnrate and bwconnburst consensus params.
Now that we understand the bug better, those two consensus params should be verboten until 0.2.2.14-alpha is obsolete.
So piece one: note in dir-spec.txt about the old behavior of the broken params (apparently undocumented so far).
Piece two: come up with new names that we can use instead, and note them in dir-spec.
Piece three: teach Tor relays to read those new names instead. Should be an easy fix: connection_or.c: (int)networkstatus_get_param(NULL, "bwconnrate", connection_or.c: (int)networkstatus_get_param(NULL, "bwconnburst",