Fix script for case when neeed to setup cluster
in an existen VPC and subnet with ip mask example: 10.0.0.0/8.

Fixed bug to detect ip of master if provided MASTER_RESERVED_IP.

For some reason detecting master ip was moved to volumes and only when MASTER_RESERVED_IP=auto.
If specify IPv4 for MASTER_RESERVED_IP like `52.1.1.1`, than we could
not detect ip even during last steps of setuping cluster.
step the KUBE_MASTER_IP is reseted because there are no tag for the
volume.