There should be more UTF-8 characters in the test suit

[timthelion]

Right now, there is no guarantee that UTF-8 characters work in things like subuser names. It is just not tested.

[timthelion]

Things that need to be tested:

• [x] Repository names
• [x] Repository paths/URIs
• [x] subuser names
• [x] image source names
• [x] Unicode in the output of the Docker daemon/mock Docker daemon

In permissions.json

• [x] executable
• [x] user dir paths
• [x] system dir paths
• [x] description
• [x] maintainer
• [x] inherit-envvars

[timthelion]

Kind of changing this issue. Doctest doesn't support utf-8 well on python2. So this becomes more difficult: Re-writing the test suit...

[timthelion]

Unfortunately, it seems this also requires dropping support for python2. Ah well. Utf-8 is more important to me.