ODL: Rework opnfv-quagga building/packaging.

ODL: Rework opnfv-quagga building/packaging.

My initial goal was to split the ODL patch in two patches:
- leveldb + leveldbjni arm64 support;
- opnfv-quagga building/packing for multiple archs (UBUNTU_ARCH);

However, due to the design of opnfv-packaging repo, it is easier to:
- patch upstream sources to support native arm64 builds (see [1]);
- add prebuilt arm64 binaries to output dir in git repo (like amd64),
submitted as pull request upstream [2];

Until above OPNFV-QUAGGA changes land upstream or are refactored,
rely on forked repository that contains above patches [3] on
branch "stable/colorado".

opnfv-quagga patch adding UBUNTU_ARCH parsing is more or less there
to detect missing DEBs, rather than filter prebuilt DEBs, which for
now only cover "amd64 arm64".

[1] https://github.com/nikolas-hermanns/opnfv-quagga-packaging/pull/1
[2] https://github.com/nikolas-hermanns/opnfv-quagga-packaging/pull/2
[3] https://github.com/alexandruavadanii/opnfv-quagga-packaging

Change-Id: I022c1e82531d82422486f2041c70a3f50b6ca386
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>