Exclude playbooks/legacy from bashate linter
Exclude playbooks/legacy from bashate linter

playbooks/legacy will contain a bunch of automatically migrated
bash things that we don't necessarily expect will be up to bashate
standards. Let's not run bashate on those.

Change-Id: Ibd3cc91ab370d42f6d80b03e5a6c91410621dc5d

openstack-infra/project-config,openstack-infra/project-config