Merge ceilometer-collector and ceilometer-collector-udp

This will simplify deployment.

Change-Id: Iabf88eafae4e95825016d382cfa86ceb8c38f880
Move dispatcher a level up

Dispatcher as it is designed now is used by both collector and
agent-notification, so let's move it level upper. This makes a more flat
hierarchy.

Change-Id: I681bf58f0b26cca22a48e6655db2547e59f9e805
Remove the collector submodule

It's useless to have a submodule with just one service, simplify the
hierarchy.

Change-Id: I4c39ea74fc5cb59d487626b998eaed9c5cf30eff
Use map_method from stevedore 0.12

This simplifies the code a bit.

Change-Id: If8b95bf8cd8c240efde51aa8b268a26998042345
Merge "Merge ceilometer-collector and ceilometer-collector-udp"
Merge "Move dispatcher a level up"
Merge "Remove the collector submodule"
Merge "Use map_method from stevedore 0.12"