Add the ability to connect service to multiple networks

[olljanat]

Is your feature request related to a problem? Please describe.
#848 was about ability to join individual containers to networks and it was implemented on PR #927 but looks that it have not been ever implemented for services.

Describe the solution you'd like
Implement "Join Network" button to service details page.

[perebusquets]

Any updates on this?

[Sveeeeeen]

Still waiting :)