[PATCH] tests: add compatibility layer

[Mikhail]

On 16:32 09-Mar 2017 David Bremner wrote:
> From: Mikhail <mp39590 at gmail.com>
> 
> Make test-lib-common.sh load test-lib-<$PLATFORM>.sh to create
> additional shim for platform specifics.
> 
> Use test-lib-FREEBSD.sh to call GNU utilities instead of native ones.
> 
> - amended by db following Tomi's suggestions

I've tested the patch on FreeBSD and it works fine.