xci: playbooks: Fixes various ansible-lint warnings

xci: playbooks: Fixes various ansible-lint warnings

In preparation for adding support for the 'ansible-lint' tool we fix
various problems in our playbooks to make the tool happy before we make
it mandatory.

Some of the problems that are fixed here are

- [ANSIBLE0011] All tasks should be named
- [ANSIBLE0012] Commands should not change things if nothing needs doing
- [ANSIBLE0013] Use shell only when shell functionality is required
- [ANSIBLE0010] Package installs should not use latest

installer-type:osa
deploy-scenario:os-nosdn-nofeature
Change-Id: I66c759d3932a414b81b2846393d2d98ce80c0b6d
Signed-off-by: Markos Chandras <mchandras@suse.de>