Revert "adding missing gradle wrapper jar"

This reverts commit bcb63683c33c5484db67a6623e85b1eacb9232f8.
Revert "changed .deb and .rpm packaging to use Gradle wrapper + Netflix Nebula os-package-plugin"

This reverts commit 6e9a1cc098083aa0bfc83f546d21595f6af72dfa.