Also simplify `lib.sh` after supporting changes incorporated
into automation library 2.x+ (present in all VM and container images).
* No need to force-load `/etc/profile` and handle it's expectation
to **not** being in `errexit` mode.
* Slightly re-arrange loading of automation library files for
clarity.
* Update comments.
Signed-off-by: Chris Evich <cevich@redhat.com>