Remove from master more changes files already merged in release-0.2.9

changes/20460

-  o Minor bugfixes (testing):
-    - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
-      removed the ECDH ciphers which caused the tests to fail on
-      platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.

changes/bug20484

-  o Minor bugfixes (single onion services):
-    - Start correctly when creating a single onion service in a
-      directory that did not previously exist. Fixes bug 20484; bugfix on
-      0.2.9.3-alpha.
-

changes/bug20529

-  o Minor bugfixes (hidden services):
-    - When configuring hidden services, check every hidden service directory's
-      permissions. Previously, we only checked the last hidden service.
-      Fixes bug 20529; bugfix on 13942 commit 85bfad1 in 0.2.6.2-alpha.

changes/bug20533

-  o Minor bugfixes (consensus downloads):
-    - If a consensus expires while we are waiting for certificates to download,
-      stop waiting for certificates.
-    - If we stop waiting for certificates less than a minute after we started
-      downloading them, do not consider the certificate download failure a
-      separate failure.
-      Fixes bug 20533; bugfix on commit e0204f21 in 0.2.0.9-alpha.

changes/bug20534

-  o Minor bugfixes (directory download scheduling):
-    - Remove the maximum delay on exponential-backoff scheduling.
-      Since we now allow an infinite number of failures (see ticket
-      20536), we must now allow the time to grow longer on each failure.
-      Fixes part of bug 20534; bugfix on 0.2.9.1-alpha.
-    - Use initial delays and decrements in download scheduling closer to
-      those from 0.2.8. Fixes another part of bug 20534; bugfix on
-      0.2.9.1-alpha.

changes/bug20536

-  o Major bugfixes (download scheduling):
-    - When using an exponential backoff schedule, do not give up on
-      dowloading just because we have failed a bunch of times.  Since
-      each delay is longer than the last, retrying indefinitely won't
-      hurt. Fixes bug 20536; bugfix on 0.2.9.1-alpha.
-

changes/bug20587

-  o Minor bugfixes (download timing):
-    - When determining when to download a directory object, handle times
-      after 2038 if the operating system supports that.  (Someday this will be
-      important!)  Fixes bug 20587; bugfix on 0.2.8.1-alpha.
-

changes/bug20588

-  o Minor features (portability):
-    - Fix compilation with OpenSSL 1.1 and less commonly-used
-      CPU architectures. Closes ticket 20588.

changes/bug20591

-  o Minor bugfixes (relay bootstrap):
-    - Ensure relays don't make multiple connections during bootstrap.
-      Fixes bug 20591; bugfix on 0.2.8.1-alpha.

changes/bug20593

-  o Minor bugfixes (client directory scheduling):
-    - Treat "relay too busy to answer request" as a failed request and a
-      reason to back off on our retry frequency. This is safe now that
-      exponential backups retry indefinitely, and avoids a bug where we would
-      reset our download schedule erroneously.
-      Fixes bug 20593; bugfix on 0.2.9.1-alpha.

changes/geoip-november2016

-  o Minor features (ge0oip):
-    - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
-      Country database.
-