samples/pktgen: Use bash as interpreter
These scripts use the non-POSIX 'function' and 'local' keywords so they won't work with every /bin/sh. We could drop 'function' as it is a no-op, but 'local' makes for cleaner scripts. Require use of bash. Signed-off-by: NBen Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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