socat: allow more complex command line options

Current implementation of socat's init service doesn't allow to run more
complex configurations. As an example there's no possibility to execute
following command:

  socat TCP-LISTEN:8080,fork,reuseaddr,bind=192.168.1.1 \
    EXEC:"/sbin/ip netns exec somenetns socat STDIO TCP:10.0.0.1:80"

In such command the first line is argv[1] and the second line is
argv[2]. SocatOptions config option is a string. As as a consequence of
this each word will be passed as a separate argv element. Socat won't be
able to parse arguments correctly.

In order to mitigate this issue, we can also accept SocatOptions as a
list of strings. Following config file will work correctly:

config socat 'tunnel_8080_into_somenetns'
	option enable '1'
	list SocatOptions 'TCP-LISTEN:8080,fork,reuseaddr,bind=192.168.1.1'
	list SocatOptions 'EXEC:"/sbin/ip netns exec somenetns socat STDIO TCP:10.0.0.1:80"'

While we're at it, pass stdout and stderr into logread.

Signed-off-by: Dobroslaw Kijowski <dobo90@gmail.com>

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