RFR 8171423: Relocate /test/lib/security/SecurityTools.java

[Amanda Jiang]

Hi All,

Please help to review the webrev below, which moves the utility class 
SecurityTools to root repo.

Bug: https://bugs.openjdk.java.net/browse/JDK-8171423
Webrev: http://cr.openjdk.java.net/~amjiang/8171423/webrev.00/

Thanks,
Amanda