[backend] Pass vm-disk option down to build

Make sure that build uses the same
vm-disk than bs_worker in the emulator backend case.
[backend] strip flags from remote meta, make getpackagelist die on missing remote projects
[backend] use a valid license for product .spec files
[api] offer a raw route for scripts to parse json
Merge remote-tracking branch 'upstream/master'
[backend] Sync vm-disk/swap defaults with build

Build and bs_worker had different defaults on
vm-disk/swap, which caused e.g. job killing to
not work correctly if only defaults were used
(only happens in default installations, not
in our production setup).