Istio Gateway parameter in sdms

Arturo Hernandez [EPAM]requested to merge
ah/sdms_gw_parametrized into master

Parametrized istio gateway in standard ddms, useful when using additional istio gw for temp deployment.

Also useful for deprecated installation method (Istio gateway configured in osdu namespace instead of istio namespace), in this case we can setup the value --set ingress.istio.gateways[0]=osdu/istio-gateway

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