This function is used to install the gcloud CLI for the GKE Google Cloud.
From $url we get the full package and install it in $dir local folder as a subdir of /root. Defaults are available for a simple call without parameters: gcloud_install()
ssh_update_transactional_system($host);
Connect to the remote host $instance using ssh and update the system by running zypper update twice, in transactional mode. The first run will update the package manager, the second run will update the system. Transactional systems like SLE micro used transactional_update up and reboot.