Ignore python cache folder(s)

This single line matches (ignores) all possible __pycache__ folders in
any part of the tree.

[1] 422bf777a558a6b78f438f94d70ed9af5ea38362

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: Ic725283399e97ba24cb18cafb16375fd490ce50c
2 files changed