armv8r64-extras/test: Add test cases for docker

Add new test cases to check docker engine installation, daemon
and runtime.

Issue-Id: SCM-4872
Signed-off-by: Robbie Cao <robbie.cao@arm.com>
Signed-off-by: Jiacheng Tang <jiacheng.tang@arm.com>
Change-Id: I522f8eafe88355f715e80d3f898eb1bafd0025dc