test(rxBreadcrumbs): Remove hover functionality.

This is just needless overhead. The value/severity ratio is pretty
terrible here, given any updates to hover functionality will require
pretty senseless page object updates. Also, it exposes functionality
which is too low-level and confusing from a user's perspective.
Merge pull request #527 from rackerlabs/e2e-rx-breadcrumbs-remove-hover

test(rxBreadcrumbs): Remove hover functionality.