consul/gen_hosts: script for generating hosts entries

This is useful when DNS issues make the statusim.net domain unusable.
You can connect to a Consul host using an IP and tunnel `8500` port:
```
ssh -L 8500:localhost:8500 admin@178.128.136.23
```

Signed-off-by: Jakub Sokołowski <jakub@status.im>

consul/gen_hosts.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+CONSUL_URL="${CONSUL_URL:-http://localhost:8500/v1/catalog}"
+
+readarray -t DCS < <(curl -s "${CONSUL_URL}/datacenters" | jq -r '.[]')
+
+for DC in "${DCS[@]}"; do
+    echo "# DC: ${DC}"
+    curl -s "${CONSUL_URL}/nodes?dc=${DC}" | jq -r '.[] | [.Address, .Node] | @tsv' 
+done