Repomaker: consider noarch when collect packages

Repomaker: consider noarch when collect packages

When repomaker collects packages from live repository it should also
consider noarch packages.

Currently it skips noarch/ directories. If submission also contains
architecture-dependent packages noarch packages just silently skipped.
However, when submission contains only noarch packages then nothing is
copied and this causes image creation failure. We were 'lucky' that
submissions we've tested didn't contain noarch packages. That's why we
didn't notice this bug.

This is a serious bug and requires to be fixed also in pre_release_obs
code, where only binary architectures are processed.

This changes fixes only repomaker. With this fix repomaker is able to
collect noarch packages.

This change partly fixes issue 1324.

Change-Id: Iba6f978ef2207aa9562f4e46c1bc596142f73ef4
Signed-off-by: Ed Bartosh <eduard.bartosh@intel.com>