parametrization of prometheus jinja2 template

it allows activating/desactivating blocks of prometheus jobs
by setting variables at begining
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>

snmp_setcomm_ee_vnf/helm-charts/eechart/prometheus-job-template.j2

+{# change to 'true' or 'false' according to your requirements #}
+{% set snmpexporter = true %}
+
+{% if snmpexporter %}
 -   job_name: '{{ JOB_NAME }}'
     static_configs:
       - targets:
@@ -12,4 +16,4 @@
         target_label: instance
       - target_label: __address__
         replacement: {{ EXPORTER_POD_IP }}:{{ EXPORTER_POD_PORT }}  # The SNMP exporter's real hostname:port.
-
+{% endif %}