HttpClientMock2 not enabled due to race condition

Steps to Reproduce:

1. Building or releasing mod-user-import master fails when run locally from the shell

The unit tests succeed when run from IDE and on Jenkins.

Cause is a race condition:
https://github.com/folio-org/raml-module-builder/blob/v33.0.1/domain-models-runtime/src/main/java/org/folio/rest/RestVerticle.java#L114-L119
https://github.com/folio-org/raml-module-builder/blob/v33.0.1/domain-models-runtime/src/main/java/org/folio/rest/tools/client/HttpClientFactory.java#L17-L21

Mocking can be enabled by setting a Verticle DeploymentOption. RestVerticle reads it and passes this information to HttpClientFactory by setting a system property.
HttpClientFactory checks the system property when the class loader loads the HttpClientFactory class, this might be before RestVerticle sets the system property (race condition).

Solution: RestVerticle should also programmatically enable mocking in HttpClientFactory.