stack/erp5: fix software release URL promise that was not executed

Promise from a8271791 (stack/erp5: new promise to check software
release URL of zope instances, 2020-12-04) was never executed. Adding
the section seemed to be change timing to make the upgrade test, but
this was not correct to not run the promise.

For more detail see discussion on
!1414 (comment 189341)

stack/erp5/instance-erp5.cfg.in

@@ -280,6 +280,7 @@ software-type = zope
 {% for custom_name, zope_parameter_dict in six.iteritems(zope_partition_dict) -%}
 {%   set partition_name = 'zope-' ~ custom_name -%}
 {%   set section_name = 'request-' ~ partition_name -%}
+{%   set check_software_url_section_name = 'check-software-url' ~ partition_name -%}
 {%   set promise_software_url_section_name = 'promise-software-url' ~ partition_name -%}
 {%   set check_test_runner_url_section_name = 'check-test-runner-url' ~ partition_name -%}
 {%   set promise_test_runner_url_section_name = 'promise-test-runner-url' ~ partition_name -%}
@@ -336,7 +337,7 @@ config-command = {{ '${' ~ check_test_runner_url_section_name ~ ':path}' }}
 {%   endif -%}
 
 
-[{{ promise_software_url_section_name }}]
+[{{ check_software_url_section_name }}]
 # Promise to wait for zope partition to use the expected software URL,
 # used on upgrades.
 recipe = slapos.cookbook:check_parameter
@@ -345,6 +346,12 @@ expected-not-value =
 expected-value = ${slap-connection:software-release-url}
 path = ${directory:bin}/${:_buildout_section_name_}
 
+[{{ promise_software_url_section_name }}]
+<= monitor-promise-base
+promise = check_command_execute
+name = ${:_buildout_section_name_}.py
+config-command = {{ '${' ~ check_software_url_section_name ~ ':path}' }}
+
 {% do root_common.section(promise_software_url_section_name) -%}
 
 {% endfor -%}