Install numpy from a binary source:

Installing numpy with pip involves building
things from source, which can add a couple
of minutes to image builds for certain elements,
such as nova.

This change installs a numpy binary via the
system package manager to avoid building from
source.

Change-Id: I5abef473ce689249a29744a03f5b8802125edd7c

Conflicts:
	elements/os-svc-install/install.d/04-os-svc-install