mount: Restore binfmt_misc content in case of missing mount
mount: Restore binfmt_misc content in case of missing mount

In case of mount image is not containing binfmt_misc mountpoint,
add temporary mountpoint to mount tree and try to restore
binfmt_misc content in ordinary way. Then, umount temporary mountpoint.

v4: New
v5: Check for opts.has_binfmt_misc to determine if image presents
v6: Check for binfmt_misc_list to determine if binfmt_misc entries present

Signed-off-by: Kirill Tkhai <e5b39230c99b4d3ebd6aa54f6d823f95134bc39d@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

eabatalov/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu