Read EXTRA_OPTS from env in kolla-ansible script

Read EXTRA_OPTS from env make it possible that using arbitrary
ansible-playbook parameters in kolla-ansible script. like

    EXTRA_OPTS='--limit control' kolla-ansible deploy

Change-Id: I10e0dafb6138d91facdb66a2f487cdeca4689c28

tools/kolla-ansible

@@ -69,7 +69,7 @@ find_base_dir
 INVENTORY="${BASEDIR}/ansible/inventory/all-in-one"
 PLAYBOOK="${BASEDIR}/ansible/site.yml"
 VERBOSITY=
-EXTRA_OPTS=
+EXTRA_OPTS=${EXTRA_OPTS}
 CONFIG_DIR="/etc/kolla"
 PASSWORDS_FILE="${CONFIG_DIR}/passwords.yml"
 DANGER_CONFIRM=