gio-tool-info: Print unix mount information where available

"gio info" output doesn't contain any information about unix mounts, which is a pity, because such info can be used for debugging purposes as various functionality depends on g_unix_mount_at() resp. g_unix_mount_for(). Let's print unix mount info and local path if available.

Signed-off-by: Simon McVittie smcv@collabora.com

Updated by Ondrej Holy oholy@redhat.com to resolve various issues from !576 (closed).