Hello, Please review this small update for keytool.
"keytool -printcert -jarfile" doesn't work with jars which were signed with algorithms listed in "jdk.jar.disabledAlgorithms" security property.
The patch below resets "jdk.jar.disabledAlgorithms" security property before reading a jar file, and prints a warning.
I also re-wrote readjar.sh test, and added SecurityTools class with a couple of re-usable methods for jarsigner and keytool (those methods are based on methods from TimestampCheck.java).
Bug: https://bugs.openjdk.java.net/browse/JDK-8168882 Webrev: http://cr.openjdk.java.net/~asmotrak/8168882/webrev.00/ Artem
