Validates that hostLabel traits are applied correctly for operation inputs.
- Validates that if an operation's endpoint hostPrefix has labels
then it must have input.
- Validates that a corresponding top-level input member can be found
for each label in each operation endpoint hostPrefix.
- Validates that the correct type target type and traits are used for
labels.
- Validates that all labels in the endpoint hostPrefix of each
operation have corresponding hostLabel traits.
- Validates that an expanded version of each endpoint hostPrefix of
each operation is a valid RFC 3896 host.
- Validates that the host prefix SHOULD end in a period if it contains
host labels.