Update python:2 to include "pip" by default

library/python

@@ -5,6 +5,6 @@ latest: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9
 3.4: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 3
 3: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 3
 
-2.7.7: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 2
-2.7: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 2
-2: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 2
+2.7.7: git://github.com/docker-library/docker-python@771cb8f39dee0850092b978346a8c95ba0d9c273 2
+2.7: git://github.com/docker-library/docker-python@771cb8f39dee0850092b978346a8c95ba0d9c273 2
+2: git://github.com/docker-library/docker-python@771cb8f39dee0850092b978346a8c95ba0d9c273 2