consul config file step in install.yml is not idempotent

[colin-nolan]

The consul config file step in install.yml sporadically makes changes to /etc/consul.conf, without a change in the configuration.

The problem is that the order of the values in the retry_join list keeps changing. e.g. I have observed the value of retry_join in /etc/consul.conf initially as:

"retry_join": ["192.168.102.51", "192.168.102.47"],

Then changed to:

"retry_join": ["192.168.102.47", "192.168.102.51"],

Other properties use unsorted lists, which would also cause this issue.