[jdk11u] RFR: 8275887: jarsigner prints invalid digest/signature algorithm warnings if keysize is weak/disabled

[Goetz Lindenmaier]

I backport this change from 17u because I had to do adaptions for 17 that 
are needed here, too.  I needed further fixes, though:

src/java.base/share/classes/sun/security/pkcs/SignerInfo.java
Slight difference in context, change applies to code clean.
I had to change a record to a class to make the change compile
with Java 11.

src/jdk.jartool/share/classes/sun/security/tools/jarsigner/Main.java
Chunks don't apply because in 11 method JAR_DISABLED_CHECK 
lacks the prefix JAR_.
checkWeakKey() and  checkWeakAlg() are not implemented in 11. Hunk omitted.

test/jdk/sun/security/tools/jarsigner/TimestampCheck.java
Resolved adding bugID to @bug.

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Commit messages:
 - Backport 6bc6980a7d975dbe06b319bf6ac9625749663060

Changes: https://git.openjdk.org/jdk11u/pull/56/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u&pr=56&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8275887
  Stats: 126 lines in 9 files changed: 42 ins; 30 del; 54 mod
  Patch: https://git.openjdk.org/jdk11u/pull/56.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u pull/56/head:pull/56

PR: https://git.openjdk.org/jdk11u/pull/56