Improve Discovery error reporting in case of incorrect configuration #53
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fixes #52
This allows to have a better error reporting in case of installation failure via the discovery.
Due to API restriction, the code is not very nice and duplicates some classes from amalgam.
However a better fix has been provided directly in amalgam (https://git.eclipse.org/r/#/c/118366/ and https://bugs.eclipse.org/bugs/show_bug.cgi?id=531789 )
So this PR will have to be reverted as soon as the gerrit patch has been accepted and deployed in the official eclipse update site.