swapoff: umount swap-backed fs before switching off swap

Factor out umounting. Explicitly skip umounting API directories, rather
than matching on fs type. This allows us to e.g. unmount all tmpfs but leaving
/run and /dev/shm alone.

v3: fixed some regressions in v2, made 'API filesystems' less general
v2: new umount_all implementation based on proposal by Dave and input from
Anthony. Also, ignore ramfs as it is not backed by swap.

Cc: Dave Reisner <d@falconindy.com>
Cc: C Anthony Risinger <anthony@xtfx.me>
Signed-off-by: Tom Gundersen <teg@jklm.no>

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