MacSignTest.testCodesignUnspecifiedFailure
and all SigningAppImageTwoStepsTest tests fail JDK-8375240.

# MacSignTest.testCodesignUnspecifiedFailure:

[21:59:38.548] TRACE: assertEquals(1): Check command tool provider [jpackage --type app-image --app-image MacSignTest/testCodesignUnspecifiedFailure/output/CodesignUnspecifiedFailureMacSignTest.app --mac-sign --mac-signing-keychain jpackagerTest.keychain --mac-app-image-sign-identity 'Developer ID Application: jpackage.openjdk.java.net'](10) exited with 1 code
[21:59:38.548] ERROR: Unexpected null value: Check output contains ["codesign" failed with following output:] string

# SigningAppImageTwoStepsTest:

[22:02:58.754] TRACE: exec: Execute tool provider [jpackage --type app-image --app-image SigningAppImageTwoStepsTest/test.cda4a09e/appimage/SigningAppImageTwoStepsTest.app --mac-sign --mac-signing-keychain jpackagerTest.keychain --mac-signing-key-user-name jpackage.openjdk.java.net --verbose](11); echo out+err...
jdk.jpackage.internal.model.JPackageException: The value "SigningAppImageTwoStepsTest/test.cda4a09e/appimage/SigningAppImageTwoStepsTest.app" provided for parameter --app-image is not a directory