[8u] RFR 8233228: Disable weak named curves by default in TLS, CertPath, and Signed JAR

[Alexander Scherbatiy]

​Hello,

Could you review the backport of P2 JDK-8233228 to 8u.

Bug: https://bugs.openjdk.java.net/browse/JDK-8233228
11u patch: https://hg.openjdk.java.net/jdk-updates/jdk11u/rev/a17295342862
8u webrev: http://cr.openjdk.java.net/~alexsch/sercher/8233228/webrev.00


8233228 backport to 8u (compared to 11u):
* sun.security.ec.ECParameters -> sun.security.util.ECParameters
* sun.security.ec.NamedCurve   -> sun.security.util.NamedCurve
* sun.security.ec.CurveDB      -> sun.security.util.CurveDB
* security/tools/keytool fixed context difference
* DisabledAlgorithmConstraints.java fixed context difference
* Manual merge in ConstraintsParameters.java (XECKey, NamedParameterSpec 
are not available in 8u).
* CurveDB.SPLIT_PATTERN, CurveDB.getSupportedCurves() made public
* NamedCurve class, getName(), getObjectId() made public
* ECParameters.getAlgorithmParameters() made public
* files java.security-<platform> are separate in each platform, applied 
identical changes in all

The are no new failures in hotspot and compact3 tests comparing to the 
build without the fix.

Thanks,
Alexander.