Also includes some other minor cleanup.
Fixes #8682
Change-Id: Iba0a35d5ea9a97b0020f506f610630471c59748b
* Use com.vaadin.v7 * Use the same class name as in Vaadin 7 * Use a "vaadin7-" declarative prefix for Vaadin 7 components Change-Id: I19a27f3835b18980b91a4f8f9464b2adde1a5fd5