Use 2.0.0-ONAP tag instead beijing branch

To ensure reproducible deployments, change gerrit branches to
2.0.0-ONAP tag instead of using the beijing branch since the
beijing branches are not locked.

Change-Id: I30bbece5fa2e0b8622db948d45e08a46ecf43ece
Issue-ID: INT-506
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
9 files changed