[LTP] [PATCH 3/3] network/tst_net.sh: extend the pattern in tst_ping_opt_unsupported()

[Petr Vorel]

Hi Alexey,

> -	ping $@ 2>&1 | grep -q "invalid option"
> +	ping $@ 2>&1 | grep -qE "(invalid|unrecognized) option"

Which implementation needs it? Both ping from iputils and busybox report
"invalid option".

Kind regards,
Petr