Added options for the buildroot, toolchain and go versions. Added help to describe variables passed to test scripts.
Added options for the buildroot, toolchain and go versions.
Added help to describe variables passed to test scripts.

mistifyio/mistify-os,mistifyio/mistify-os,trisk/mistify-os,trisk/mistify-os,trisk/mistify-os,mistifyio/mistify-os