Merge remote-tracking branch 'dgoulet/ticket27215_035_01'

changes/ticket27215

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+  o Major feature (hidden service):
+    - For a newly created hidden service, the default version is now 3. Tor
+      still supports version 2 service but the operator now needs to
+      specifically set "HiddenServiceVersion 2" in order to create a new
+      service.
+
+      For existing services, tor now learns the version by reading the key
+      file so the HiddenServiceVersion is not mandatory in that case. Closes
+      ticket 27215.