serialise: Split functions user for serialisation from util.c

The read_all_buf() and write_all_buf() functions in util.c are
primarily used for serialising data structures to a stream during
migraiton.  We're going to have further use for such serialisation
when we add dynamic configuration updates, where we'll want to share
the code with the client program.

To make that easier move the functions into a new serialise.c
file, and rename thematically.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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