remove variable helpers module from our configuration DSL #2719

Job	Run time
build-and-publish-test-image	16s
test-negative (dd-lib-ruby-init-test-rails-conflict)	1m 15s
test-negative (dd-lib-ruby-init-test-rails-bundle-deploy)	1m 10s
test (network, dd-lib-ruby-init-test-rails)	8m 30s
test (network, dd-lib-ruby-init-test-rails-explicit)	10m 10s
test (network, dd-lib-ruby-init-test-rails-gemsrb)	10m 22s
test (network, use-admission-controller, dd-lib-ruby-init-test-rails)	8m 58s
test (network, use-admission-controller, dd-lib-ruby-init-test-rails-explicit)	9m 13s
test (network, use-admission-controller, dd-lib-ruby-init-test-rails-gemsrb)	11m 1s
	1h 0m 55s

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