fix cancel button events

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
invoke super() on non tab keypresses

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
switch to multiinstallNewMaas and remove unused code in MultiInstall
Merge pull request #172 from Ubuntu-Solutions-Engineering/refactor-multiinstall

switch to multiinstallNewMaas and remove unused code in MultiInstall
Extend cloud-init template to support defining custom network interfaces

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>