Show connection details on abra server ls

Closes https://git.autonomic.zone/coop-cloud/abra/issues/110.

abra

@@ -1565,10 +1565,23 @@ List locally-defined servers."
 
 sub_server_list() {
   get_servers
+
+  warning "Loading status from ${#SERVERS[@]} server(s), patience advised.."
   printf "%s servers:\n\n" "${#SERVERS[@]}"
+
+  local -a idx=0
   for SERVER in "${SERVERS[@]}"; do
-    echo "  ${SERVER##*/}"
-  done
+    if [[ "$idx" == 0 ]]; then
+      printf "  NAME\tCONNECTION\n"
+      printf "  --\t--\t\n"
+    fi
+
+    name="${SERVER##*/}"
+    host=$(docker context inspect "$name" -f "{{.Endpoints.docker.Host}}" 2>/dev/null)
+    printf "  %s\t%s\t%s%s\n" "$name" "${host:-UNKNOWN}"
+
+    idx+=1
+  done | column -s'	' -t
 }
 
 ###### .. server init