Add projects filter to zuul dashboard

It builds aditional attribute 'project' for each change queue with the
list of projects in this change queue joined by the '|' character. Any
actions with the filter field will invoke show/hide process for all
change queues. Currently only change queues will be displayed that are w/o
at least one project that's not filtered out.

Change-Id: I4c92844b9473a271b97d7598218e2f4f5f81c1f4
Merge "Add projects filter to zuul dashboard"