Removes several pylint warnings.

This patche removes 93 pylint deprecation warnings due to invalid escape
sequences (mostly 'invalid escape sequence \d') on unicode strings.

Signed-off-by: Rafael Guterres Jeffman <rjeffman@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipapython/certdb.py

@@ -554,7 +554,7 @@ class NSSDatabase:
         chain = result.output.splitlines()
 
         for c in chain:
-            m = re.match('\s*"(.*)" \[.*', c)
+            m = re.match(r'\s*"(.*)" \[.*', c)
             if m:
                 root_nicknames.append(m.groups()[0])