1. Added "webroot/js/dashboard-utils.js" with common dashboard code

2. Moved common templates from "dashboard.tmpl" to "webroot/views/contrail-common.view"
3. Moved templateLoader class to "dashboard.tmpl" as need to load "contrail-common.view" before contrail JS scripts are loaded
4. Updated dev-install.sh script to include dashboard-utils.js in contrail-all-5.js