[8u] RFR 8238452: Keytool generates wrong expiration date if validity is set to 2050/01/01

[Aleksey Shipilev]

Original bug:
  https://bugs.openjdk.java.net/browse/JDK-8238452
  https://hg.openjdk.java.net/jdk/jdk/rev/c27d95f72ba8

It does not apply to 8u even after reshuffling, because there are minor conflicts. I reapplied all
hunks by hand. X509CRLImpl.java already has copyright updated.

8u webrev:
  https://cr.openjdk.java.net/~shade/8238452/webrev.8u.01/

Testing: new test (fails before patch, passes with it)

-- 
Thanks,
-Aleksey