selftests: net: Remove executable bits from library scripts

[ Upstream commit 9d851dd ]

setup_loopback.sh and net_helper.sh are meant to be sourced from other
scripts, not executed directly. Therefore, remove the executable bits from
those files' permissions.

This change is similar to commit 49078c1 ("selftests: forwarding:
Remove executable bits from lib.sh")

Fixes: 7d15750 ("selftests/net: GRO coalesce test")
Fixes: 3bdd9fd ("selftests/net: synchronize udpgro tests' tx and rx connection")
Suggested-by: Paolo Abeni <[email protected]>
Signed-off-by: Benjamin Poirier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: gobenji