Add local bindep.txt
Add local bindep.txt

As it was announced [1] global bindep-fallback.txt was removed and now
projects need to have a local bindep.txt to be able to install binary
dependencies for testing.

In test jobs the script tools/test-setup.sh is called which requires
mysql and postgres servers and clients to be installed.

[1] http://lists.openstack.org/pipermail/openstack-discuss/2019-June/007272.html

Change-Id: I3f7186f1b76d5500d699b588b8257fae9fdcfc6e

openstack/tap-as-a-service,openstack/tap-as-a-service