The dispatcher interface was removed due to publisher interface.
Also remove leftover of transformers which were removed.
Note that gnocchi publisher is enabled by this change to make sure
that metrics goes to gnocchi, instead of notification which may not
persist sent metrics.
Change-Id: Ie5c124ecf0f9d08752b36a4e28e5687990a9bd5c
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
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