Disallow all ambiguous boolean values for Boolean

Disallow all ambiguous boolean values for Boolean

In release 1.1, the :class:`.Boolean` type was broken in that
boolean coercion via ``bool()`` would occur for backends that did not
feature "native boolean", but would not occur for native boolean backends,
meaning the string ``"0"`` now behaved inconsistently. After a poll, a
consensus was reached that non-boolean values should be raising an error,
especially in the ambiguous case of string ``"0"``; so the :class:`.Boolean`
datatype will now raise ``ValueError`` if an incoming value is not
within the range ``None, True, False, 1, 0``.

Change-Id: If70c4f79c266f0dd1a0306c0ffe7acb9c66c4cc3
Fixes: #4102