Merge branch 'maint-0.2.9' into maint-0.3.5

changes/ticket28795

+  o Minor features (fallback directory list):
+    - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
+      in December 2018 (of which ~122 were still functional), with a
+      list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
+      in June 2019. Closes ticket 28795.