Bug 576083 – pre-unmount signals not being triggered
Bug 576083 – pre-unmount signals not being triggered

Basically emit GVolumeMonitor::mount-pre-unmount on the volume monitor
and retry unmount operation a couple of times.

halfline/gvfs,gicmo/gvfs,halfline/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,gicmo/gvfs,philipl/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,cpatulea/gvfs,cpatulea/gvfs,halfline/gvfs,philipl/gvfs,philipl/gvfs,xkahn/gvfs-cmis,gicmo/gvfs,thiblahute/gvfs,thiblahute/gvfs