Add attribute sample_source

The sample_source is used to specific the source name of emitted
samples.It required to use different name if you want to consolidate
the data from different openstack region.
Changed the version to 9.1.2 and modified the change log and readme.

Change-Id: I0c2e0b6d651ad6c4daf724041014582b31337073
Changed the action of all package resources from default to :upgrade

Since no version is specified for any package and usually you do not
want to stick with one unspecific version you get during your first run
the action should be :upgrade.

Change-Id: Idc662737f1b03049de5555c6e1e54fc77532972f
Implements: blueprint allow-package-updates