[BZ 1069679] Expose responseTime metric via rest

callTimes are exposed via endpoint GET /metric/data/{scheduleId}/callTime
supported are both aggregated (default) and 'raw' callTime data. CallTime
values can be pushed via PUT /metric/data/{scheduleId}/callTime. Note that
data retrieved via GET has different format as what is pushed. User pushes
really RAW callTimes (time,callDestination,duration) but he *always*
recieves aggregates.