Move DD code into its own directory (#6)

reference/ddtrace/util.py

@@ -0,0 +1,20 @@
+# [Backward compatibility]: keep importing modules functions
+from .utils.deprecation import deprecated, deprecation
+from .utils.formats import asbool, deep_getattr, get_env
+from .utils.wrappers import safe_patch, unwrap
+
+
+deprecation(
+    name='ddtrace.util',
+    message='Use `ddtrace.utils` package instead',
+    version='1.0.0',
+)
+
+__all__ = [
+    'deprecated',
+    'asbool',
+    'deep_getattr',
+    'get_env',
+    'safe_patch',
+    'unwrap',
+]