Added lldbsuite.lldb_test_root, switched formatter to use it.

llvm-svn: 254894
diff --git a/lldb/packages/Python/lldbsuite/__init__.py b/lldb/packages/Python/lldbsuite/__init__.py
index fb65606..aa6874e 100644
--- a/lldb/packages/Python/lldbsuite/__init__.py
+++ b/lldb/packages/Python/lldbsuite/__init__.py
@@ -18,3 +18,11 @@
 
 # lldbsuite.lldb_root refers to the root of the git/svn source checkout
 lldb_root = find_lldb_root()
+
+# lldbsuite.lldb_test_root refers to the root of the python test tree
+lldb_test_root = os.path.join(
+    lldb_root,
+    "packages",
+    "Python",
+    "lldbsuite",
+    "test")