[PATCH] travis: Use docker scripts

[Geoff Levand]

Hi Sam,

On 08/15/2018 09:34 AM, Geoff Levand wrote:
>> + - ./docker/build-pb --check --verbose --configure-opts "--enable-platform-arm64 --enable-platform-powerpc"
> 
> The /sbin/dmidecode in configure.ac is OK for buildroot, but for the ubuntu
> based docker image we'll need:
>   
>   --configure-opts "HOST_PROG_DMIDECODE=/usr/sbin/dmidecode --enable-platform-arm64 --enable-platform-powerpc"

Sorry, I sent this out in a hurry (had a meeting to get to)
and should have been more clear.  If we want to run the
discover binary in the pb-builder container to test it
we'll need to set HOST_PROG_DMIDECODE, for arm64 at least.

As of now, we don't need this though.

-Geoff