Elide bootloader password in grub plugin

The grub.conf configuration file collected by the grub plugin may
contain a plaintext or md5 hashed bootloader password. Add a regex
substitution for all files matching '.*\/grub\.conf' and replace
the password with '*'s.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

sos/plugins/grub.py

@@ -30,4 +30,11 @@ def setup(self):
             "/etc/grub.d"
         ])
 
+    def postproc(self):
+        self.do_path_regex_sub(
+            r".*\/grub.conf",
+            r"(password)\s(--md5)\s(.*)",
+            r"\1 \2 ********"
+        )
+
 # vim: et ts=4 sw=4