TKG checks Docker version, but not Podman

[LongyuZhang]

Currently TKG has the function of checking Docker version, but for machines with Podman, it will show
docker : not on docker
We can add a similar function to check Podman too.

[llxia]

TKG/src/org/openj9/envInfo/MachineInfo.java

Line 232 in 6e73a9f

putInfo(new Info("docker", CHECK_DOCKER_CMD, ce.execute(CHECK_DOCKER_CMD), null));

[llxia]

We should check both docker --version and podman --version. Please update the current CHECK_DOCKER_CMD and add check for podman.

[llxia]

@sophiaxu0424 please take a look at this issue. Thanks

[llxia]

PR #565