utils/check-package: allow to disable warning for a line

Currently any exceptions for a check function need to be coded into the
check-package script itself.

Create a pattern that can be used in a comment to make check-package
ignore one or more warning types in the line immediately below:
 # check-package Indent, VariableWithBraces

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

utils/checkpackagelib/base.py

@@ -1,10 +1,12 @@
 # See utils/checkpackagelib/readme.txt before editing this file.
+import re
 
 
 class _CheckFunction(object):
     def __init__(self, filename, url_to_manual):
         self.filename = filename
         self.url_to_manual = url_to_manual
+        self.disable = re.compile(r"^\s*# check-package .*\b{}\b".format(self.__class__.__name__))
 
     def before(self):
         pass