sfd: Don't forget to test sfd_map when closing old fds

is_any_service_fd didn't check for service file descriptor
being marked in sfd_map in result we may end up leaving
some garbage file obtained from the program executing
criu.

[root@sqvm0910 criu-stable.git]# ll /proc/354877/fd
lr-x------ 1 root root 64 May 16 19:03 114 -> /
lr-x------ 1 root root 64 May 16 19:03 115 -> /
l--------- 1 root root 64 May 16 19:03 117 -> /18311 (deleted)
lr-x------ 1 root root 64 May 16 19:03 119 -> /vzt/del/vzctl-rm-me.X1JH4vI (deleted)

We are to test if the file descriptor was indeed installed
explicitly.

https://jira.sw.ru/browse/PSBM-83892



Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>