RFR (XS): 8023134: Rename VM LogFile to hotspot_pid{pid}.log (was hotspot.log)

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8023134/webrev.00/
7 lines changed: 4 ins; 0 del; 3 mod

Added pid of the Java process to default name of VM log file:
	- old: hotspot.log
	- new: hotspot_pid{pid}.log

It allows to avoid hotspot.log overwrite/corruption in multi-VM test 
scenarios and simplifies hs_err/ciReplay/hotspot.log files matching.

Thanks!

Best regards,
Vladimir Ivanov