Remove log arg that fails with prometheus 2.0

(cherry picked from commit 7d97dae)
(cherry picked from commit f366ee0)

Change-Id: I99d525d5ca42c1a21eb622cef51088abefc5578a
(cherry picked from commit 548e42f)

Author: JohnGarbutt

ansible/roles/prometheus/templates/prometheus-server.json.j2

@@ -1,5 +1,5 @@
 {
-    "command": "/opt/prometheus/prometheus --config.file /etc/prometheus/prometheus.yml --web.listen-address {{ api_interface_address | put_address_in_context('url') }}:{{ prometheus_port }} --web.external-url={{ internal_protocol }}://{{ kolla_internal_fqdn | put_address_in_context('url') }}:{{ prometheus_port }} --storage.tsdb.path /var/lib/prometheus{% if prometheus_cmdline_extras %} {{ prometheus_cmdline_extras }}{% endif %}",
+    "command": "/opt/prometheus/prometheus -config.file /etc/prometheus/prometheus.yml -web.listen-address {{ api_interface_address | put_address_in_context('url') }}:{{ prometheus_port }} -web.external-url={{ internal_protocol }}://{{ kolla_internal_fqdn | put_address_in_context('url') }}:{{ prometheus_port }} -storage.local.path /var/lib/prometheus{% if prometheus_cmdline_extras %} {{ prometheus_cmdline_extras }}{% endif %}",
     "config_files": [
         {
             "source": "{{ container_config_directory }}/prometheus.yml",