JIRA: https://jira.spring.io/browse/INT-4120
INT-3899 moved creating the pollingTask to start() to allow modification
of the advice chain between starts.
Since a new pollingTask is created on each start, this was fine for general advices.
However, for `AbstractMessageSourceAdvice`s, which only advise the `receive()` operation,
the advices are re-applied on every start.
When starting, first remove any advices we added on the previous start.
This handles the case when the source is a naked object, or already a proxy when supplied
to the SPCA.
Remove uneeded cast
Polishing - PR Comments
Honor some Java 8 code practice
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