standalone-shared: more python 3 fixes (execfile)

These crontabs were using execfile which has been removed on python 3.

Switch to `slapos console script.py` syntax which was introduced in
slapos 1.4.5

playbook/roles/standalone-shared/tasks/main.yml

@@ -13,7 +13,7 @@
       user=root
       name="ERP5 Instance Request"
       minute=*/5
-      job="/bin/echo 'execfile(\"/tmp/playbook-request-{{ playbook_name }}\")' | /usr/bin/slapos console > /dev/null 2>&1"
+      job="/usr/bin/slapos console '/tmp/playbook-request-{{ playbook_name }}' /dev/null 2>&1"
 
   - name: create frontend request script
     template: src={{ request_frontend_template }} dest=/tmp/playbook-request-frontend-{{ playbook_name }} mode=0700
@@ -24,7 +24,7 @@
       user=root
       name="ERP5 Frontend Request"
       minute=*/5
-      job="/bin/echo 'execfile(\"/tmp/playbook-request-frontend-{{ playbook_name }}\")' | /usr/bin/slapos console > /dev/null 2>&1"
+      job="/usr/bin/slapos console '/tmp/playbook-request-frontend-{{ playbook_name }}' /dev/null 2>&1"
 
   - name: Create firewall script
     template: src={{ firewall_setup_template }} dest=/tmp/playbook-firewall-setup-{{ playbook_name }} mode=0700