Let bridge users use the non-primary address of a multi-homed bridge

changes/bait-and-switch-bridges

@@ -0,0 +1,8 @@
+  o Minor bugfixes:
+    - If you run a bridge that listens on multiple IP addresses, and
+      some user configures a bridge address that uses a different IP
+      address than your bridge writes in its router descriptor, and the
+      user doesn't specify an identity key, their Tor would discard the
+      descriptor because "it isn't one of our configured bridges", and
+      fail to bootstrap. Now believe the descriptor and bootstrap anyway.
+      Bugfix on 0.2.0.3-alpha.