A dot is a valid character in interface names and is often used in the
names of VLAN interfaces. The sysctl net.ipv6.conf.<ifname>.disable_ipv6
key path cannot use dots both in the ifname and as path separator.
We switch to using / as key path separator so dots are allowed in the
ifname.
This works because sysctl.Sysctl() accepts key paths with either dots
or slashes as separators.
Also, print error message to stderr in case sysctl cannot be read
instead of silently hiding the error.
Signed-off-by: David Verbeiren <david.verbeiren@tessares.net>
9b09f167bb