Fix scheduler rpcapi deprecated method comment

A comment was added for 2.10 about deprecating a method.  It's not
necessary to bump the version... and the manager side wasn't bumped.
It's still at 2.9.

Just remove the reference to the 2.10 version.

Change-Id: I52857f5a2e472dbdf13b9b6a51a9e8f401ea6452
Merge "Fix scheduler rpcapi deprecated method comment"