tree b0babc07fa0cd9a00c8b072618f7492434884746
parent ec6bd8dea77478f32981a5df49f66ca2430ad19d
author Anthony Liguori <aliguori@us.ibm.com> 1242942840 -0500
committer Anthony Liguori <aliguori@us.ibm.com> 1242957280 -0500

Refactor how display drivers are selected

My previous commit, f92f8afebe,  broke -vnc (spotted by Glauber Costa).  This
is because it's necessary to tell when the no special display parameters have
been passed and default to SDL or VNC appropriately.

This refactors the display selection logic to be less complicated which has
the effect of fixing the regression mentioned above.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>