Filters: devide by ~15 the amount of SQL queries
Filters: devide by ~15 the amount of SQL queries

On /dashboard/filters/ we drop from 807 to 51 queries

Change-Id: Ic49ae70d0faad0e2c2b853bfc415f184006515fa

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server