Revert of Enable strict coverage for step module

recipes/engine_tests/subannotations.py

Index: recipes/engine_tests/subannotations.py
diff --git a/recipes/engine_tests/subannotations.py b/recipes/engine_tests/subannotations.py
new file mode 100644
index 0000000000000000000000000000000000000000..04519be28e903f7dfcaa8b95d1afdeb260775946
--- /dev/null
+++ b/recipes/engine_tests/subannotations.py
@@ -0,0 +1,12 @@
+# Copyright 2015 The LUCI Authors. All rights reserved.
+# Use of this source code is governed under the Apache License, Version 2.0
+# that can be found in the LICENSE file.
+
+DEPS = ['step']
+
+def RunSteps(api):
+  api.step('Dont subannotate me', ['echo', '@@@BUILD_STEP@steppy@@@'])
+  api.step('Subannotate me', ['echo', '@@@BUILD_STEP@pippy@@@'], allow_subannotations=True)
+
+def GenTests(api):
+  yield api.test('basic')