The `login_as_admin_and_visit` helper was used a lot but isn't really
shorter than:
login_as_admin
visit path_visit
Calling those methods separately reduces line length. It also removes
the potential impression that it may be more efficient to use the
helper. Now we have less indirection if one of the calls fails and see
the failing spec line straight away.
It was often used with a `visit` statement after which resulted in
unnecessary page loads. There was only one case where a `visit` was
expected but it wasn't needed either.
Spec files individually include the module and we specify the type of
spec in each RSpec's describe so none of this settings are needed. They
are just Spree's legacy I bet.
