Merge pull request #41 from dbeck/master

fix trace levels in sample apps, diag_client_sample works: submits logs, request log records and subscribe to log records
Merge pull request #42 from dbeck/master

config_client sample works now; updating submodule ref of common
Merge remote-tracking branch 'upstream/master'
updating common submodule; skeleton for data provider client and server
updating submodule