[Libguestfs] [PATCH 0/3] Enable FUSE support in the API via 'mount-local' call.

This patch is just for review. It enables FUSE support in the API via two new calls, 'guestfs_mount_local' and 'guestfs_umount_local'. FUSE turns out to be very easy to deadlock (necessitating that the machine be rebooted). Running the test from the third patch is usually an effective way to demonstrate this. However I have not yet managed to produce a simple reproducer that can be reported upstream and/or understand the precise bug. Rich.