feat(hostAliases): enable configuring hostAliases in rasa components #322

Job	Run time
changes	5s
lint-chart	39s
unit-tests (./test/common)	3m 39s
unit-tests (./charts/rasa/test)	2m 55s
unit-tests (./charts/rasa-action-server/test)	3m 27s
unit-tests (./charts/duckling/test)	2m 42s
kubeval-chart (v1.14.10, rasa)	11s
kubeval-chart (v1.14.10, rasa-action-server)	26s
kubeval-chart (v1.16.4, rasa)	21s
kubeval-chart (v1.16.4, rasa-action-server)	13s
kubeval-chart (v1.18.1, rasa)	26s
kubeval-chart (v1.18.1, rasa-action-server)	25s
Install chart (v1.14.10, rasa)	3m 2s
Install chart (v1.14.10, rasa-action-server)	1m 10s
Install chart (v1.16.9, rasa)	3m 10s
Install chart (v1.16.9, rasa-action-server)	1m 31s
Install chart (v1.18.4, rasa)	3m 0s
Install chart (v1.18.4, rasa-action-server)	2m 5s
Validate the PR	1s
	29m 28s

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