[MOLECULE 3.3.0] Update converge playbook file names

In 3.x.x version family of Molecule the 'playbook.yml' file
for 'converge' action has changed to 'converge.yml'.

Ref.: https://github.com/ansible-community/molecule/issues/2560

Change-Id: I8710ebd5710237be138f2aff8943d6c949058dbd
Issue-ID: OOM-2722
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
48 files changed