Merge branch 'maint-0.2.7'

changes/bug17668

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+  o Major bugfixes (voting):
+    - When collating votes by Ed25519 identities, authorities now
+      include a "NoEdConsensus" flag if the ed25519 value (or lack thereof)
+      for a server does not reflect the majority consensus. Related to bug
+      17668; bugfix on 0.2.7.2-alpha.

changes/bug17702

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+  o Major bugfixes:
+    - Actually enable Ed25519-based directory collation.
+      Previously, the code had been written, but some debugging code that had
+      accidentally been left in the codebase made it stay turned off.
+      Fixes bug 17702; bugfix on 0.2.7.2-alpha.
+

changes/bug18318_ed

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+  o Major bugfixes:
+    - When generating a vote with keypinning disabled, never include two
+      entries for the same ed25519 identity.  This bug was causing
+      authorities to generate votes that they could not parse when a router
+      violated key pinning by changing its RSA identity but keeping its
+      Ed25519 identity.  Fixes bug 17668; fixes part of bug 18318.  Bugfix on
+      0.2.7.2-alpha.

changes/bug18368

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+  o Minor bugfixes:
+    - When logging information about an unparseable networkstatus vote or
+      consensus, do not say "vote" when we mean consensus. Fixes bug
+      18368; bugfix on 0.2.0.8-alpha.
+