use fully qualified, locatable names for all use of api.named_type()

use fully qualified, locatable names for all use of api.named_type()

Fixed mypy regression where the release of mypy 0.930 added additional
internal checks to the format of "named types", requiring that they be
fully qualified and locatable. This broke the mypy plugin for SQLAlchemy,
raising an assertion error, as there was use of symbols such as
``__builtins__`` and other un-locatable or unqualified names that
previously had not raised any assertions.

Fixes: #7496
Change-Id: I037680606a1d51158ef6503508ec76c5d5adc946