This happens because on line 59 of /usr/bin/wsrep_sst_mysqldump
we have a check :
   "if ! $MYSQL_CLIENT --version | grep 'Distrib 10.1' >/dev/null"
but the client is 10.2 so it doesnt match the grep expression.

Fixed check to be:
      "if ! $MYSQL_CLIENT --version | grep 'Distrib 10.' >/dev/null"
so that every 10. version is accepted.