travis: Manually install python-dbus
travis: Manually install python-dbus

Now used by GObject eventloop registration, Zeroconf integration, and keyring
integration.

glogiotatidis/mopidy,ZenithDK/mopidy,quartz55/mopidy,bencevans/mopidy,tkem/mopidy,abarisain/mopidy,mopidy/mopidy,rawdlite/mopidy,adamcik/mopidy,priestd09/mopidy,priestd09/mopidy,hkariti/mopidy,SuperStarPL/mopidy,liamw9534/mopidy,rawdlite/mopidy,kingosticks/mopidy,mopidy/mopidy,ZenithDK/mopidy,jcass77/mopidy,bacontext/mopidy,diandiankan/mopidy,bacontext/mopidy,ali/mopidy,hkariti/mopidy,bencevans/mopidy,vrs01/mopidy,quartz55/mopidy,woutervanwijk/mopidy,hkariti/mopidy,glogiotatidis/mopidy,jcass77/mopidy,hkariti/mopidy,woutervanwijk/mopidy,vrs01/mopidy,glogiotatidis/mopidy,adamcik/mopidy,dbrgn/mopidy,dbrgn/mopidy,mokieyue/mopidy,diandiankan/mopidy,bencevans/mopidy,ZenithDK/mopidy,rawdlite/mopidy,diandiankan/mopidy,jodal/mopidy,mopidy/mopidy,tkem/mopidy,priestd09/mopidy,ZenithDK/mopidy,liamw9534/mopidy,swak/mopidy,ali/mopidy,pacificIT/mopidy,adamcik/mopidy,rawdlite/mopidy,quartz55/mopidy,mokieyue/mopidy,SuperStarPL/mopidy,kingosticks/mopidy,jmarsik/mopidy,jodal/mopidy,dbrgn/mopidy,jmarsik/mopidy,ali/mopidy,jmarsik/mopidy,bencevans/mopidy,swak/mopidy,abarisain/mopidy,pacificIT/mopidy,vrs01/mopidy,jodal/mopidy,mokieyue/mopidy,diandiankan/mopidy,kingosticks/mopidy,tkem/mopidy,vrs01/mopidy,glogiotatidis/mopidy,bacontext/mopidy,pacificIT/mopidy,pacificIT/mopidy,jcass77/mopidy,SuperStarPL/mopidy,tkem/mopidy,mokieyue/mopidy,swak/mopidy,quartz55/mopidy,swak/mopidy,SuperStarPL/mopidy,dbrgn/mopidy,ali/mopidy,bacontext/mopidy,jmarsik/mopidy