RFR(S): 8150823: UL disables log outputs incorrectly

[Marcus Larsson]

Hi,

Please review the following patch to fix a bug in UL where -Xlog:disable 
would not disable all logging if there are multiple LogFileOutputs 
configured. The problem is that disable_logging() iterates the list of 
log outputs from start to end, removing outputs as it goes and thus 
modifying the list it iterates over. The fix is to let it pop outputs 
off the end of the list instead.

Webrev:
http://cr.openjdk.java.net/~mlarsson/8150823/webrev.00/

Issue:
https://bugs.openjdk.java.net/browse/JDK-8150823

Testing:
Modifed test through JPRT

Thanks,
Marcus