Before signing, unsign all executables and libraries (not just those in runtime). Also, run individual file sign and unsign commands in quiet mode. Also, add test case to SigningAppImageTest to test that signing app that has additional launcher works, and results in validly signed launcher and additional launcher (original reported problem).
------------- Commit messages: - JDK-8276837: [macos]: Errorwhen signing the additional launcher Changes: https://git.openjdk.java.net/jdk/pull/6636/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6636&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8276837 Stats: 64 lines in 3 files changed: 33 ins; 5 del; 26 mod Patch: https://git.openjdk.java.net/jdk/pull/6636.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/6636/head:pull/6636 PR: https://git.openjdk.java.net/jdk/pull/6636
