Merge remote-tracking branch 'tor-github/pr/1864/head'

changes/bug33900

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+  o Minor bugfixes (IPv4, relay):
+    - Check for invalid zero IPv4 addresses and ports, when sending and
+      receiving extend cells. Fixes bug 33900; bugfix on 0.2.4.8-alpha.

changes/bug33917

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+  o Minor bugfixes (logging, testing):
+    - Make all of tor's assertion macros support the ALL_BUGS_ARE_FATAL and
+      DISABLE_ASSERTS_IN_UNIT_TESTS debugging modes. Implements these modes
+      for IF_BUG_ONCE(). (It used to log a non-fatal warning, regardless of
+      the debugging mode.) Fixes bug 33917; bugfix on 0.2.9.1-alpha.

changes/ticket33817

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+  o Major features (IPv6, relay):
+    - Relays may extend circuits over IPv6, if the relay has an IPv6 ORPort,
+      and the client supplies the other relay's IPv6 ORPort in the EXTEND2
+      cell. IPv6 extends will be used by the relay IPv6 ORPort self-tests in
+      33222. Closes ticket 33817.
+    - Consider IPv6-only EXTEND2 cells valid on relays. Log a protocol warning
+      if the IPv4 or IPv6 address is an internal address, and internal
+      addresses are not allowed. But continue to use the other address, if it
+      is valid. Closes ticket 33817.
+    - If a relay can extend over IPv4 and IPv6, it chooses between them
+      uniformly at random. Closes ticket 33817.
+    - Re-use existing IPv6 connections for circuit extends. Closes ticket 33817.

changes/ticket33901

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+  o Minor features (IPv6, relay):
+    - Allow clients and relays to send dual-stack and IPv6-only EXTEND2 cells.
+      Parse dual-stack and IPv6-only EXTEND2 cells on relays.
+      Closes ticket 33901.