pstack: skip tests on UEK4

Signed-off-by: Stephen Brennan <[email protected]>

Author: brenns10

tests/test_pstack.py

@@ -15,6 +15,12 @@
 from drgn_tools.task import task_cpu
 
 
+pytestmark = [
+    # Only test UEK5+
+    pytest.mark.kver_min("4.14"),
+]
+
+
 @pytest.fixture
 def sleeping_proc():
     proc = Popen(