Move completed specs to pike 9.0 & 9.1

This moves the specs that were completed towards the end of
the Pike cycle, to the 9.0 release folder. Due to the race-condition
bug in rolling upgrades, we consider that feature completed in 9.1.

Change-Id: I1dabd2124e15184d5a7f829c52f6fa1bfd66edc0

doc/source/index.rst

@@ -66,6 +66,24 @@ development cycles in which they were completed.
 Pike
 ------
 
+9.1
+~~~
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   specs/9.1/*
+
+9.0
+~~~
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   specs/9.0/*
+
 8.0
 ~~~