Increase the pip default timeout to 60

For devstack jobs this timeout has been increase to 60 which has
problems downloading from the openstack pypi index all but disappear.
Ifd4689283e53d6afb7a76b480e004cdde3b302f6
At the same time we increased the tripleo timeout to 30 and saw an
improvement, increasing to 60 should see the remaining occurrences
of this error being reduced again.

Fixes: bug #1292141
Change-Id: Ib99b1b8bfd4530ef73d246060bd741cefe241808
Merge "Increase the pip default timeout to 60"