[lit] Update lit's own tests to use lit_config and lit package, as appropriate.

llvm-svn: 188107
diff --git a/llvm/utils/lit/tests/Inputs/exec-discovery-in-tree/lit.cfg b/llvm/utils/lit/tests/Inputs/exec-discovery-in-tree/lit.cfg
index 342b2fd..ae25b4f 100644
--- a/llvm/utils/lit/tests/Inputs/exec-discovery-in-tree/lit.cfg
+++ b/llvm/utils/lit/tests/Inputs/exec-discovery-in-tree/lit.cfg
@@ -1,6 +1,8 @@
+import lit.formats
+
 # Verify that the site configuration was loaded.
 if config.test_source_root is None or config.test_exec_root is None:
-    lit.fatal("No site specific configuration")
+    lit_config.fatal("No site specific configuration")
 
 config.name = 'exec-discovery-in-tree-suite'
 config.suffixes = ['.txt']