bpo-39567: Add audit for os.walk(), os.fwalk(), Path.glob() and Path.rglob(). (GH-18372)

diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index a5f3313..cfa574a 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -1134,6 +1134,7 @@
         """Iterate over this subtree and yield all existing files (of any
         kind, including directories) matching the given relative pattern.
         """
+        sys.audit("pathlib.Path.glob", self, pattern)
         if not pattern:
             raise ValueError("Unacceptable pattern: {!r}".format(pattern))
         drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
@@ -1148,6 +1149,7 @@
         directories) matching the given relative pattern, anywhere in
         this subtree.
         """
+        sys.audit("pathlib.Path.rglob", self, pattern)
         drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
         if drv or root:
             raise NotImplementedError("Non-relative patterns are unsupported")