tab completion for interfaces incorrectly adds ':' to a snap name

[James Troup]

If I type:

 snap interfaces ohmy<tab>

I get:

 snap interfaces ohmygiraffe:

And snappy complains:

 error: invalid value: "ohmygiraffe:" (want snap:name or snap)

The tab completion has figured out I'm completing a snap name (rather than an interface), so I'd expect to get:

 snap interfaces ohmygiraffe

This is with snapd 2.31.1 on an Ubuntu 16.04 system.

[Ian Johnson (anonymouse67)]

The `snap interfaces` command has now been deprecated and the `snap connections` is now the command to use to inspect interface connections. I cannot reproduce the issue in this bug with the `snap connections` command, so I'm closing this.

[John Lenton (chipaca)]

eh... i'm uncomfortable about closing this.

the bug is still there, we're still offering these bad completions. 'snap interfaces' is deprecated but not removed. The fix should be straightforward (even though we expect it not to live long, it might... temporary workarounds living forever and all that)

I'm reopening, setting as a papercut.