RFR: 8260286: Manual Test "ws/open/test/jdk/sun/security/tools/jarsigner/compatibility/Compatibility.java" fails

[Fernando Guallini]

Fixing manual Test "ws/open/test/jdk/sun/security/tools/jarsigner/compatibility/Compatibility.java". It was not handling "weak algorithm" warning during jarsigner output verification

-------------

Commit messages:
 - rename method
 - handle warning for SHA-1 weak algorithm

Changes: https://git.openjdk.java.net/jdk/pull/2224/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2224&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260286
  Stats: 19 lines in 2 files changed: 17 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2224.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2224/head:pull/2224

PR: https://git.openjdk.java.net/jdk/pull/2224