Spring 3.2.3 registers MBean operations with parameter names
instead of the JVM default p1, p2 etc based on parameter position
in the method signature.
Since the OperationInvokingMessageHandler matched the supplied
arguments using the p1, p2 etc names, this prevented the control
bus from finding the target method.
Fall back to the old naming scheme based on parameter position
if a matching parameter is not found.
Add a test using a Map payload to supply the named arguments (p1, p2).
Add an ignored test that tests using named arguments (key, channelName).
Test with 3.1.4; remove Ignore and test with 3.2.3.
TODO: remove the Ignore annotation when SF 3.2.3 is the minimum.
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