update host  from localhost to 127.0.0.1

02/04 10:42:37 WARN Longview[6223] - DBI connect('host=localhost;','longview',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /opt/linode/longview/Linode/Longview/DataGetter/Applications/MySQL.pm line 69