app-layer: remove ALPROTO_TEST and tests

app-layer: remove ALPROTO_TEST and tests

These tests purpose seems to have been lost.
Registering a alproto with a parser function that always fails,
and just testing that AppLayerParserParse returned -1...
We would get the same result  without registering a parser function,
or using ALPROTO_FAILED as argument to AppLayerParserParse

The comment says "Test the deallocation of app layer parser memory
on occurrence of error in the parsing process."
but I do not see how this is tested.