[11u] RFR: 8248745: Add jarsigner and keytool tests for restricted algorithms

[Lindenmaier, Goetz]

Hi,

I am downporting this for parity with 11.0.9-oracle. 
It is a new test that didn't make it to 11.0.9, I will
push it to 11.0.10.

http://cr.openjdk.java.net/~goetz/wr20/8248745-jarsigner_test-jdk11/01/

I had to replace the name SHA256 by SHA-256 to 
make the test work.

https://bugs.openjdk.java.net/browse/JDK-8248745
https://hg.openjdk.java.net/jdk/jdk/rev/7cf5207e2d6a

Best regards,
  Goetz.