Set 'last ping' time for host based on ping.timeout and ping.interval global config values
(currentTime - (ping.timeout * ping.interval)) instead of using hardcoded value of (currentTime - 10mins)
Adding first cut(draft) for marvincli

Signed-off-by: Santhosh Edukulla <santhosh.edukulla@gmail.com>
vGPU add and list host test cases with review comments
vGPU automation changes removing the host password