When marionette-eval calls fail in gui-test-program, the installation
continues which results in two scenarios:
- hang forever at the next marionette-eval call,
- keep going and start a broken installation, which is annoying because it
clears the terminal and hides the error.
Make sure that gui-test-program is exited with #f return code when one of the
marionette-eval calls fail.
* gnu/tests/install.scm (gui-test-program): Add a new macro
"marionette-eval*". Throw an exception when one on the marionette-eval calls
fail.
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