Add redis configuration for install script and CF template

[GMartinez-Sisti]

What

• When the parameter EC2ASGDesiredCapacity is higher than 1 (defaults to 2), the stack will now deploy a Redis Replication Group with 2 nodes, this is required for communication between Fyde Orchestrators

Test

• Tested upgrade path successfully from currently available stack
• Checks inside one instance (partly redacted):

  
  [ec2-user@ip-10-200-0-99 ~]$ sudo cat /etc/systemd/system/fydeproxy.service.d/10-environment.conf
  [Service]
  Environment='FYDE_ENVOY_LISTENER_PORT=443'
  Environment='FYDE_REDIS_HOST=xxxxxx.oy8bqq.ng.0001.euw1.cache.amazonaws.com'
  Environment='FYDE_REDIS_PORT=6379'

[ec2-user@ip-10-200-0-99 ~]$ nc xxxxxx.oy8bqq.ng.0001.euw1.cache.amazonaws.com 6379 keys 5 $46 proxy_key_caaxxxxxf2a8 $57 discoverer_sync_wait_caa8xxxxxx5cf4f2a8 $55 upstream_resources_caa80xxxxxx4f2a8 $75 tls_sessions_ticket_caa806xxxxxx54188 $60 upstream_resources_caa806xxxxx4f2a8_time