fix: log a reason for possible ssh failure

configure.sh

@@ -287,7 +287,7 @@ verify_ansible_hosts() {
         if ssh -q -o BatchMode=yes -o ConnectTimeout=5 "${!node_username}"@"${!var}" "true"; then
             _log "INFO" "Successfully SSH'ed into host '${!var}' with username '${!node_username}'"
         else
-            _log "ERROR" "Unable to SSH into host '${!var}' with username '${!node_username}'"
+            _log "ERROR" "Unable to SSH into host '${!var}' with username '${!node_username}', did you copy over your SSH key?"
             exit 1
         fi
     done