VEC-454 TLS small refactor, remove TLS footgun, multi-roll handling

[arrowplum]

Script now does not let you install with tls and roles until that is supported and other ease of use changes.

❯  ./full-create-and-install-gke.sh --help
Usage: ./full-create-and-install-gke.sh [options]
Options:
  --chart-location, -l <path>  If specified expects a local directory for AVS Helm chart (default: official repo)
  --cluster-name, -c <name>    Override the default cluster name (default: joem-performance-eco-avs)
  --machine-type, -m <type>    Specify the machine type (default: n2d-standard-4)
  --num-avs-nodes, -a <num>     Specify the number of AVS nodes (default: 3)
  --num-query-nodes, -q <num>  Specify the number of AVS query nodes (default: 0)
  --num-index-nodes, -i <num>  Specify the number of AVS index nodes (default: 0)
  --num-aerospike-nodes, -s <num>  Specify the number of Aerospike nodes (default: 3)
  --run-insecure, -I           Run setup cluster without auth or tls. No argument required.
  --help, -h                   Show this help message

[hev]

Approved. I was able to deploy clusters that don't really work (e.g. 0 index nodes) but this is a good improvement. This is probably ok. I do think we should coordinate this with the following docs change - https://github.com/citrusleaf/aerospike-websites/pull/1722