8385839: JMX config file correction

[kevinjwalls]

A mistake from the original commit where the hashed passwords feature was added.

The example at the end of the template file is malformed, some original plaintext is left in when showing the example of how it would be replaced with hashes.

While we are here, removing a line that mentions Security Manager.

This is all comments, no code is changed.

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Issue

• JDK-8385839: JMX config file correction (Bug - P4)

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