RFR: 8259401: Add checking to jarsigner to warn weak algorithms used in si… [v3]

[Hai-May Chao]

> The jarsigner tool currently provides warning associated with the signer’s cert when it uses weak algorithms, but not for the CA certs. This change is to process the signer’s cert chain to warn if CA certs use weak algorithms.

Hai-May Chao has updated the pull request incrementally with one additional commit since the last revision:

  remove comment about checking sigalg for trusted cert

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2042/files
  - new: https://git.openjdk.java.net/jdk/pull/2042/files/5a3e184a..88d94dfd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2042&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2042&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2042.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2042/head:pull/2042

PR: https://git.openjdk.java.net/jdk/pull/2042