service: remove useless PeriodicService class

Change-Id: Ic83c83f767956a97e991f1304dea4255ba47f7b8
Signed-off-by: Julien Danjou <julien@danjou.info>
Add support for limiting the number of samples returned

Blueprint: api-limit

Change-Id: Id053eb60674fea58b3d83b460fd0344dbc050cbf
Signed-off-by: Julien Danjou <julien@danjou.info>
Merge "Add support for limiting the number of samples returned"
Merge "service: remove useless PeriodicService class"