BuildUserParams: test all code paths
BuildUserParams: test all code paths

Add some test cases to cover a couple of code paths.

Signed-off-by: Mark Langsdorf <eabffbbda805b4d9c4f51a24c4a43943d0f16369@redhat.com>

projectatomic/osbs-client,DBuildService/osbs-client,DBuildService/osbs-client,projectatomic/osbs-client