Support multiple inventory files under individual inventory directory

.gitlab-ci.yml

README.md

contrib/azurerm/README.md

contrib/network-storage/glusterfs/README.md

contrib/packaging/rpm/kubespray.spec

contrib/terraform/openstack/README.md

docs/ansible.md

docs/getting-started.md

docs/upgrades.md

docs/vsphere.md

docs/weave.md

inventory/local/group_vars

inventory/local/hosts.ini

inventory/sample/group_vars/all.yml

inventory/sample/group_vars/k8s-cluster.yml

inventory/sample/hosts.ini

roles/network_plugin/weave/tasks/seed.yml

roles/vault/defaults/main.yml

setup.cfg

tests/support/aws.groovy