[Java Broker] Add -XX:+ExplicitGCInvokesConcurrent to qpid-server[.bat]
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                 Key: QPID-2749
                 URL: https://issues.apache.org/jira/browse/QPID-2749
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker
            Reporter: Rob Godfrey


Currently JAVA_GC is set as following in qpid-server

JAVA_GC="-XX:+UseConcMarkSweepGC -XX:+HeapDumpOnOutOfMemoryError"

In the case where an explicit GC is called this can cause significant delay.  
In order to avoid this the following option should also be supplied

 -XX:+ExplicitGCInvokesConcurrent 

In the case where RMI connections are being made to the JVM, Explicit GCs may 
be being called periodically (by default every hour) causing significant pauses 
in processing without this setting.

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