RFR(S): 6545295: TEST BUG: The test HatHeapDump1Test uses wrong path in exec call.

[Yekaterina Kantserova]

Hi,

Could I please have a review of this fix.
webrev: http://cr.openjdk.java.net/~ykantser/6545295
bug: https://bugs.openjdk.java.net/browse/JDK-6545295

The test has been re-written using the testlibrary's functionality. It's 
verified internally on all basic platforms.

Thanks,
Katja