* old MAX_CONF_OPT_PATH should be enough for ipv6 path array as
len('net/ipv6/conf//mldv2_unsolicited_report_interval') is 48
but len and size are almost back to back, so increase it a bit,
to don't worry about it.

reading stable_secret before it is initialized fails with EIO,
we can safely skip dumping it in that case as in new netns it
will be uninitialized by default

v6: use __CTL_STR without len in image type
v9: set flag CTL_FLAGS_READ_EIO_SKIP for stable_secret dumping
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Reviewed-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>