Allow for automatic finding of pip/pip-python

Cherry-picked from master, commit 90263d662.

Change-Id: I4dd9d5a3902294414a3985236097a13bb2818db1
Ensure that the scripts dir is brought in during bootstrap.

Cherry-picked from commit:e2913829

Change-Id: Iad705715ee13d331887c416e6696f8587b30d841
Fixes: bug 1200722
Xattr is not getting marked as arch-dependent.

Enforce that xattr is really arch-dependent even if building
the rpm somehow says it is not (which seems to be happening).

Change-Id: Ia4c3fdc71754a04e3501550579e9640589a4be3a