Revert "Change to relative conftest.py imports"

This reverts commit 2b53c74b1c.

tests/test_cancellation.py

@@ -11,7 +11,7 @@ import pytest
 import trio
 import tractor
 
-from .conftest import tractor_test, no_windows
+from conftest import tractor_test, no_windows
 
 
 async def assert_err(delay=0):

tests/test_discovery.py

@@ -11,7 +11,7 @@ import pytest
 import tractor
 import trio
 
-from .conftest import tractor_test
+from conftest import tractor_test
 
 
 @tractor_test

tests/test_local.py

@@ -7,7 +7,7 @@ import pytest
 import trio
 import tractor
 
-from .conftest import tractor_test
+from conftest import tractor_test
 
 
 @pytest.mark.trio

tests/test_multi_program.py

@@ -6,7 +6,7 @@ import time
 
 import pytest
 import tractor
-from .conftest import (
+from conftest import (
     tractor_test,
     sig_prog,
     _INT_SIGNAL,

tests/test_spawning.py

@@ -5,7 +5,7 @@ import pytest
 import trio
 import tractor
 
-from .conftest import tractor_test
+from conftest import tractor_test
 
 statespace = {'doggy': 10, 'kitty': 4}