We used to generate first test and later QGA QAPI code into
qapi-generated/.  Commit b93b63f5 moved the test code to tests/.
Commit 54c2e502 moved the QGA code to qga/qapi-generated/.  The
directory has been unused since.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180211093607.27351-30-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Eric Blake <eblake@redhat.com>