Description of problem:
Dnf can't tab-complete names of packages after install command. It prints weird error message.

Version-Release number of selected component (if applicable):
Name        : dnf
Arch        : noarch
Epoch       : 0
Version     : 0.6.2
Release     : 1.fc21


How reproducible:
100%

Steps to Reproduce:
1. Open terminal
2. Type: `sudo dnf install gi` (the prefix of package name can differ)
3. Press 'Tab'

Actual results:
> cut: you must specify a list of bytes, characters, or fields
> Try 'cut --help' for more information.
... is printed after the command. However, misleadingly, this text is not accepted as part of entered command. I.e. Text of input and output seems mixed.


Expected results:
Complete the package name if prefix is unique, or nothing if there are multiple possibilities. (Double 'tab' to print all possibilities.)


Additional info:
Console looks like this:

$ sudo dnf install gicut: you must specify a list of bytes, characters, or fields
Try 'cut --help' for more information.
▊

^ (typing cursor is here)