tests: Prefix some test classes with 'Test'
tests: Prefix some test classes with 'Test'

We don't want to rely on them subclassing unittest.TestCase.

vrs01/mopidy,tkem/mopidy,vrs01/mopidy,mokieyue/mopidy,mokieyue/mopidy,jcass77/mopidy,mopidy/mopidy,mopidy/mopidy,kingosticks/mopidy,kingosticks/mopidy,vrs01/mopidy,vrs01/mopidy,tkem/mopidy,tkem/mopidy,jodal/mopidy,ZenithDK/mopidy,adamcik/mopidy,jcass77/mopidy,ZenithDK/mopidy,jodal/mopidy,mokieyue/mopidy,jcass77/mopidy,adamcik/mopidy,mopidy/mopidy,mokieyue/mopidy,jodal/mopidy,kingosticks/mopidy,adamcik/mopidy,ZenithDK/mopidy,tkem/mopidy,ZenithDK/mopidy