Prevent leaking of sensitive information via @Property

Some protocols inadvertently expose sensitive information via @Property, e.g.

@Property String password

This needs to be changed to

@Property(exposeAsManagedAttribute=false) String password

This way, password can be set via XML, but can not be queried via probe.sh or JMX.

Examples:

• JDBC_PING, SWIFT_PING, RACKSPACE_PING, S3_PING, GOOGLE_PING
• AUTH and plugin tokens
• ENCRYPT
• SASL (see JGRP-1853)