require new setuptools

Bug #1290562 believes new setuptools fixes the the issue now,
try a new version to see.

Change-Id: Ifcc7bf4b0e94d96fca5d87ee85de788564b4aba6
Upgrade six requirement to 1.6.0

This is needed for having URL SplitResult support.

Change-Id: I8486f8d6e07d577027856a15d60027f24cbe8782
Merge "require new setuptools"
Merge "Upgrade six requirement to 1.6.0"