Move '-6' and '-l' options from SRWL to SRWL_OPTS in Debian init-scripts.

Changing the definitions of SRWL from /sbin/shorewall6 to '/sbin/shorewall -6' and so on broke the init-scripts since the scripts test whether $SRWL is executable:

test -x $SRWL || exit 0

which now fails:

sh: test: /sbin/shorewall: binary operator expected

Signed-off-by: Jeremy Sowden

This is the same change-set that was covered by !2 (closed)

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