travis: move build/test recipe from travis yaml to build scripts

[williamcroberts]

See this thread:

• https://lore.kernel.org/selinux/CAFftDdqhO5_ZEGOAHGVZHdB9j4B86od12R1dicbTBmfwHEQS1Q@mail.gmail.com/T/#t

The TL;DR is that Travis doesn't always bail immediately on failures. This causes build errors to get buried in output logs as other build steps attempt to continue on. The best course of action thus far is to move the build steps out of the travis YAML format and into build scripts. Similar in concept for the KVM travis run. set -e -x would provide the desired exit on error and tracing the community desires.