The user can extend StandardMBean and implement the getImpact method to
override the default impact value for a given MBeanOperationInfo.

The current implementation reads the user supplied value but it ignores
it when constructing the MBeanInfo object to be returned when calling
getMBeanInfo.

The following JCK test fails:

api/javax_management/foundation/standard_mb/StandardMBeanTest.html#StandardMBeanTest

This regression has been introduced in b45. The test passed in earlier versions.

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