cmd/bent: added a simple first test

This ensures that initialization works and that ALL the
benchmark and sample configuration files parse.

2nd patch -- add copyright and build tags for 1.16

Change-Id: Ic3fb90063175dda8dc8a3edf02e7f913614c262c
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/320970
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
2 files changed