RFR: 8271868: Warn user when using mac-sign option with unsigned app-image.

[Alexander Matveev]

On Wed, 4 Aug 2021 20:00:37 GMT, Andy Herrick <herrick at openjdk.org> wrote:

> 8271868: Warn user when using mac-sign option with unsigned app-image.

First of all why we only want to cover case when app-image was produced without --mac-sign? If we want to cover such case only, then we need to use approach suggested by Alexey and record signing flag in .jpackage.xml. Otherwise, user will receive false warning if unsigned app-image is provided which was generated without using jpackage or in case if app-image was modified after it was generated and signed.

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PR: https://git.openjdk.java.net/jdk/pull/5004