module-switch-on-port-available: Do not switch profile if current port is available
For switching profiles, we are a little more cautious, only switch
from an unavailable port to an available one. Profile switching is
mainly used for HDMI/DisplayPort, and this is to avoid switching from
analog to HDMI/DP when it becomes available.
See http://lists.freedesktop.org/archives/pulseaudio-discuss/2012-March/012991.html
and replies for more information.
Signed-off-by: David Henningsson <david.henningsson@canonical.com>