Use DEFAULT section for dispatcher in doc

Section of dispatcher is moved to DEFAULT in Icehouse, it is in
collector section in Havana but already deprecated. The
doc/source/install/manual.rst still put it in collector section
which seems not good.

Change-Id: I2c5c16c2ffe0dabd19966fc79ad88e418a43a6fd
Closes-Bug: #1269521
Return trait type from Event api

fixes bug 1268032

Change-Id: I6949c1cdeab4d3b1916d90c02e12da79bda38e35
Convert alarm timestamp to PrecisionTimestamp

Before the timestamps for alarm are stored in a datetime
In mysql, datetimes have only second precision, and the datetimes are
rounded.

This patch, change the Datetime by the PrecisionTimestamp Column Type, like
the sample and the event timestamps that demand the same precision.

Change-Id: Iad10c621b276fc40b9965d01bc460bcc834b473a
Merge "Use DEFAULT section for dispatcher in doc"
Merge "Return trait type from Event api"
Merge "Convert alarm timestamp to PrecisionTimestamp"