cleaned up variables

defaults/main.yml

diff --git a/defaults/main.yml b/defaults/main.yml
index dbaebab..5c7f313 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -176,15 +176,9 @@
 influxdb_system_port: 25826
 influxdb_port: 8086
 
-grafana_username: '{{ opdk_user_name }}'
-grafana_password: '{{ grafana_username }}'
-
 # Default collectd installation file
 influxdb_installation_config: influxdb.conf
 
-# Default influxdb host
-#influxdb_host: 127.0.0.1
-
 # Local folder in which to store logs and config files
 conf_logs_dir: configs_and_logs