dbus-register: support multiple registration to the same event
dbus-register: support multiple registration to the same event

01org/cloudeebus,pohly/cloudeebus,enzuguri/cloudeebus,fpaut/cloudeebus,enzuguri/cloudeebus,01org/cloudeebus,fpaut/cloudeebus,lizardo/cloudeebus-devel,lizardo/cloudeebus-devel,enzuguri/cloudeebus,pohly/cloudeebus,modulexcite/cloudeebus,monsieurmona/cloudeebus,modulexcite/cloudeebus,fpaut/cloudeebus,monsieurmona/cloudeebus,modulexcite/cloudeebus,monsieurmona/cloudeebus,01org/cloudeebus,lizardo/cloudeebus-devel,pohly/cloudeebus