This change moves the NewClientWithOptions call into
Builder.getClient.  Since getClient is the only way for Builder and
its visitors to create a RESTClient, we can reasonably guarantee
that the request transforms will be honored.  Previously, it was
possible for a call to NewFlattenListVisitor to return resource Info
objects whose Client field did not honor the request transforms.
Signed-off-by: Monis Khan <mkhan@redhat.com>