Add etcd&onos repo as submodule and support arm64

Add etcd&onos repo as submodule and support arm64

1.forked SEBA componants`s repo to IEC repo,include:
beats-docker,etcd-operator-docker,etcd, onos
2.Add patch files inorder to aarch64 docker image support
src/use_cases/seba_on_arm/docker/build/beats-docker/build.arm
src/use_cases/seba_on_arm/docker/build/etcd-operator-docker/build.arm
src/use_cases/seba_on_arm/docker/build/etcd/build.arm
src/use_cases/seba_on_arm/docker/build/onos/build.arm
src/use_cases/seba_on_arm/patches/beats-docker/0001-Correct-path-errors-and-tar-command-errors.patch

Change-Id: I90ed064ef7264150d9c0d15312e6f2bb975e92e9
Signed-off-by: jialv01 <Jianlin.Lv@arm.com>