Fix errors with relative imports.

kernel/modelverse_kernel/main.py

@@ -1093,7 +1093,8 @@ class ModelverseKernel(object):
         else:
             # No input yet, so just wait and don't advance IP or phase
             self.input_value = None
-            raise primitive_functions.SleepKernel(0.1, True)
+            ex = primitive_functions.SleepKernel(0.1, True)
+            raise ex
 
     def output_init(self, task_root):
         task_frame, =   yield [("RD", [task_root, "frame"])]

kernel/test/rules/test_rules_input.py

@@ -1,6 +1,6 @@
 import unittest
-from modelverse_kernel.primitives import SleepKernel
-from modelverse_kernel.main import ModelverseKernel
+from kernel.modelverse_kernel.primitives import SleepKernel
+from kernel.modelverse_kernel.main import ModelverseKernel
 from test.utils import execute_until_finished, MvSWrapper
 
 class TestInput(unittest.TestCase):