Motivation:
When Maven does not run in batch mode, it will continuously print its progress as it downloads dependencies.
This can produce a very large amount of log output, that makes it harder to debug build failures.
Modification:
Make all Maven builds run in batch mode by adding the `-B` command line flag, and have transfer progress suppressed with the `-ntp` flag.
Some builds were already running batch mode but had the flag in a different location – these have had their `-B` flag moved so all builds are consistent.
Result:
Much less output in our build logs where Maven is just downloading stuff.
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