A new version of setuptools has been released (4.0.1).

Revert "Merge "Pin setuptools to < 4.0""

This reverts commit 3c71d94570b6379445119bed1c326f6bd6d6cd24, reversing
changes made to 65bc825a5a6604b1d8aa48e1566480a81f0d8766.

Change-Id: Ice688eb349db1cc7168981954cd0cd17692fdb7c
Merge "A new version of setuptools has been released (4.0.1)."