makemessages command walks through directories that match ignore_patterns

[andreiko]

./manage.py makemessages always walks through all directories in a tree, even if some directory's path matches an ignore pattern.

So we perform meaningless time-consuming scan through .svn, .git and other possible deep directories that we would like to fully ignore:

$ ./manage.py makemessages -l ru -d django -v 2
examining files with the extensions: .html
processing language ru
ignoring file .DS_Store in .
ignoring file .gitignore in .
...
ignoring file e974710282570831dbefad0e177403d07205ba in ./.git/objects/07
ignoring file da4359b0e24cb164eace2ac312af8fafff2127 in ./.git/objects/08
ignoring file f195d5a9e0cf3542ef36028fa4820d8cdf560a in ./.git/objects/08
ignoring file 26c086ebf3d6fee600fccddaf6bbc6a7f347a1 in ./.git/objects/0a
...

Suggested patch changes behavior of "walk" function defined in makemessages.py to skip directories which path matches some ignore pattern.

[Claude Paroz]

Patch with test

[Claude Paroz]

To make it work, I had to transform 'dir/*' style expressions to 'dir'.

Accessorily, to capture sdtout during the test, I had to pass around sdtout to several functions. It would be much simpler if those were methods of a class (hey ramiro).

[Jannis Leidel]

In [17441]:

Fixed #17628 -- Extended makemessages command to also ignore directories when walking, not only when looking for files. Thanks, Claude Paroz.