RFR: JDK-8238534

[René Schünemann]

For the Apple notarization process, the whole bundle in its final form
has to be signed with the codesign tool.
See the discussion here: https://bugs.openjdk.java.net/browse/JDK-8238225

This change copies all JDK/JRE files to a temporary directory, which
is then passed to the codesign tool. The temporary directory is then
used as the base directory for the bundle archive and is getting
removed after the archive has been created. This only applies when a
valid code signing identity is set and the build type is release.

Bug: https://bugs.openjdk.java.net/browse/JDK-8238534
WebRev: http://cr.openjdk.java.net/~rschuenemann/wr/2020/8238534-macos_sign_bundles/01/

Rene