[ZEPPELIN-5024] Improve Travis-CI#3897

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Reamer wants to merge 14 commits intoapache:masterfrom

Reamer:test_refactoring

Commits on Aug 27, 2020

The maven-frontend-plugin works better with an absolute path. A relative path in the PATH environment variable can be problematic.
Reamer
committed
Disable HeliumApplicationFactoryTest in SourceCode
Reamer
committed

Commits on Aug 31, 2020

Commits on Sep 1, 2020