Be safer when calling ./bootstrap

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
(cherry picked from commit d3afebe19c8a40fe694c7f9c31e9e88f3dcd8ab5)
Work around a change in pip 1.5 regarding wheels

The error message was "pip's wheel support requires setuptools >= 0.8
for dist-info support."

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
(cherry picked from commit eaa3e1240e3b7ba120f769d00f2ed28eda4a7ed1)