Add missing imports
Remove type hint template clutter
Minor cleanup in SchemaManagerFunctionalTestCase
Merge pull request #607 from JeroenDeDauw/SchemaManagerFunctionalTestCase

Minor cleanup in SchemaManagerFunctionalTestCase
Merge pull request #609 from JeroenDeDauw/type

Remove type hint template clutter
Merge pull request #608 from JeroenDeDauw/missingimp

Add missing imports