libdabba: fix Doxygen header content.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
libdabba: add interface coalesce setter function.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
rpc: add interface coalesce modify rpc call.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabbad: add interface modify rpc function.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>