Tested on an Alpine Linux Container (3.16):
- setting MTU > 65535 or < 576 via UI (doesn't work)
- setting MTU to several values >= 576 and <= 65535 via UI (works)
- setting MTU to >= 64 and < 576 via config then starting (works, but
this is apparently intended otherwise it would be a backwards
The option to set the mtu parameter for lxc containers already exists
in the backend. It just has to be exposed in the web UI as well.
Signed-off-by: Daniel Tschlatscher
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Changes from v1:
* fieldLabel for MTU textfield no longer uses gettext()
* text field has an emptyText now
* the minimum va
