RFR(XS): 8027760: JFC schema condition should not have defaults

[Erik Gahlin]

Hi,

Could I please have a review of this small fix.

The schema for .jfc files is incorrect. The true or false element should 
not default to "true" or "false" in a condition element, they should 
remain unset if the user has not specified a value. This is internal 
documentation issue, the schema is not used in the code and JMC assumes 
this is the case.

Webrev:
http://cr.openjdk.java.net/~egahlin/8027760.1

Bug:
https://bugs.openjdk.java.net/browse/JDK-8027760

Thanks
Erik