tests/int/helpers: gawk -> awk
tests/int/helpers: gawk -> awk

We use awk in other 9 or so places, and here it's gawk.
Since this is on Linux, most probably awk is gawk.

So s/gawk/awk/.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

opencontainers/runc,opencontainers/runc,opencontainers/runc,opencontainers/runc