Remove the 'thread-pool-task-executor' element now that Spring 3 provides a "task" namespace [INT-810]

[spring-operator]

Mark Fisher opened INT-810 and commented

We will also need to update the documentation so that anyone using this element for 1.0.x will know that they need to make this switch to using Spring 3's "task" namespace.

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Issue Links:

• SPR-6161 Task namespace usage should not require concurrent backport JARs
  ("depends on")

[spring-operator]

Mark Fisher commented

Moving to 2.0-M2 since it depends on this:
https://jira.springsource.org/browse/SPR-6161