PrettyTable was missing from requirements and was likely being installed
by a transient dependency. PrettyTable is used in the client to render
tables in the CLI.
Add py34 compatibility for unicode builtin. python34 tests are now
running on stable/libert, this cherry-pick fixes the broken python34
tests.
Change-Id: Ie92bfad1929a3b8014efeec996592714f3bba160
Closes-Bug: #1527023