ipsec-tools: Reduce allocated buffer size

By default, pfkey allocates a 2MB buffer that is used for SPD entries.
This size is a good choice for a server system where a lot of clients
should be handled. But on our embedded systems, an application with that
much clients is unlikely and 2MB is a lot of space. So reduce that to
the default value of 128kB which should be enough for a small number of
ipsec connections.

See https://bugzilla.redhat.com/show_bug.cgi?id=607361 for more details
why the upstream project originally increased the size.

If someone really needs a bigger size, there is a option in the
configuration file of pfkey called `pfkey_buffer` that can overwrite
this value.

Closes #4621

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