Add changes file for bug6816

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+  o Infrastructure features:
+    - Introduce new circuitmux_t storing the queue of circuits for a channel;
+      this encapsulates and abstracts the queue logic and circuit selection
+      policy, and allows the latter to be overridden easily by switching out
+      a policy object.  The existing EWMA behavior is now implemented as a
+      circuitmux_policy_t.  This fixes bug 6816.