RFR 8039080: "jinfo server_id at host" fails with "Invalid process identifier"

[Jaroslav Bachorik]

Hi,

Sorry for the noise but I need to get the fix re-reviewed.
Due to the way jtreg cooperates with TestNG when runnning in agentvm I 
can not use package private methods or constructor or fields.

The updated patch - 
http://cr.openjdk.java.net/~jbachorik/8039080/webrev.01 - makes the 
JInfo constructor a private one and removes the package private getters. 
The test is using reflection to create new instances of JInfo and to 
assert its state.

Thanks,

-JB-