[8u] RFR 8035166: Remove dependency on EC classes from pkcs11 provider

[Alexander Scherbatiy]

Hello,

Could you review the backport of JDK-8035166 to 8u.
This backport was requested during review [1] of
    JDK-8233228 Disable weak named curves by default in TLS, CertPath, 
and Signed JAR

Bug: https://bugs.openjdk.java.net/browse/JDK-8035166
11u patch: https://hg.openjdk.java.net/jdk-updates/jdk11u/rev/daa21271c03b
8u webrev: http://cr.openjdk.java.net/~alexsch/sercher/8035166/webrev.00

The classes ECParameters, NamedCurve, and CurveDB needs to be moved from 
sun.security.ec package
to sun.security.util for JDK-8233228 because sun.security.ec is placed 
in sunec.jar and these classes are not accessible
from ConstraintsParameters, DisabledAlgorithmConstraints which are 
stored in rt.jar.

8035166 backport to 8u (compared to 11u):
* Manual merge in ConstraintsParameters.java (XECKey, NamedParameterSpec 
are not available in 8u).
* files java.security-<platform> are separate in each platform, applied 
identical changes in all
* context differences in multiple files

The tests compact3, java_security, java_security_infra, needs_jdk, and 
needs_jre were run.

In total they contain the following security and crypto tests:
   sun/security/tools/jarsigner/*
   com/sun/crypto/provider/*
   com/sun/security/*
   java/security/*
   javax/crypto/*
   javax/net/ssl/*
   javax/security/*
   javax/xml/crypto/*
   sun/security/*
   security/infra/java/security/*

The are no new failures comparing to the build without the fix.

[1] 
https://mail.openjdk.java.net/pipermail/jdk8u-dev/2020-December/013164.html

Thanks,
Alexander.