tests: iptables-test: Pass netns to execute_cmd()

The command to run might have to be prefixed. Once if the command is
'iptables' (or related) to define the variant, once if '-N' was given to
run the command inside the netns. Doing both prefixing inside
execute_cmd() avoids a potential conflict and thus simplifies things:
The "external command" and "external iptables call" lines become
identical in handling, there is no need for a separate prefix char
anymore.

As a side-effect, this commit also fixes for delete_rule() calls in
error case ignoring the netns value.

Signed-off-by: Phil Sutter <phil@nwl.cc>

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