move SMS Connectivity to Settings header on messages page.
Add a class-based view for adding/editing gateways and make sure the forms use crispy forms.
make sure new uis for add/edit gateways show up in the subnavigation for the Gateways on Messages tab
rename Mach -> Syniverse
render template for RecordListWidget
implement get_form_class and get_generic_name on TestBackend
Add description to Gateway List
use new edit gateway page
allow deletion of gateway from gateway list
added support for load balancing mixin from giovanni's latest changes
Merge pull request #3508 from dimagi/commconnect-gateways

Update Gateway (SMS Connection) View in CommConnect to match feedback