Merge branch 'dgoulet/bug21302_030_01_squashed'

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+  o Minor bugfixes (hidden service):
+    - Two possible underflow which would ultimately lead to creating a lot of
+      introduction points circuits and closing them in a non stop loop. Fixes
+      bug 21302; bugfix on tor-0.2.7.2-alpha.
+    - Cleanup expiring intro point nodes if no circuit is associated to it
+      anymore. It was causing, rarely, the service to not open enough
+      introduction points circuit in the case we had dead expiring nodes.;
+      bugfix on tor-0.2.7.2-alpha.