Removing value from istio.env (#96)

This commit will remove the value from the DOMAIN key in the istio.env file.
It was mistakenly pushed with a value that varies.
It no longer needs a value

Signed-off-by: tonyxrmdavidson <tonyxrmdavidson@yahoo.co.uk>

openshift-ci/resources/samples/istio/components/istio.env

@@ -1,5 +1,5 @@
 AUTH_PROVIDER=opendatahub-auth-provider
 ISTIO_INGRESS=ingressgateway
-DOMAIN=apps.rk415.apicurio.integration-qe.com
+DOMAIN=
 REST_CREDENTIAL_NAME=modelregistry-sample-rest-credential
 GRPC_CREDENTIAL_NAME=modelregistry-sample-grpc-credential