Use build.sh for vpp build

Use build.sh for vpp build

https://gerrit.fd.io/r/#/c/765/
is refactoring the vagrant to have a separate
build.sh suitable for use outside of vagrant.
It autodetects supported distros, installs dependencies,
etc.

This patch switches vpp jenkins jobs over to using
build.sh.  This should give us a unified path where:

1) CI Builds
2) Vagrant
3) Users starting out on their own Centos/Ubuntu boxes
for the first time

are all using the same build.sh.

Change-Id: Iae7bca4e2a9e183e878d7638701e66735b388cbc
Signed-off-by: Ed Warnicke <eaw@cisco.com>