Revert "Fixing deprecation warnings"

This reverts commit 82b9b59522928863ddadeacfec819e287303ef20.

Change-Id: I746d7ae57802dc76618db9024a0cf94c43774c02

templates/gerritbot.config.erb

@@ -1,14 +1,14 @@
 [ircbot]
-nick=<%= @nick %>
-pass=<%= @password %>
-server=<%= @server %>
+nick=<%= nick %>
+pass=<%= password %>
+server=<%= server %>
 port=6667
 channel_config=/etc/gerritbot/channel_config.yaml
 lockfile=/var/run/gerritbot/gerritbot.pid
 log_config=/etc/gerritbot/logging.config
 
 [gerrit]
-user=<%= @user %>
+user=<%= user %>
 key=/home/gerrit2/.ssh/gerritbot_rsa
-host=<%= @vhost_name %>
+host=<%= vhost_name %>
 port=29418