Add SetProperty event
Add SetProperty event

It is emitted after new properties are saved on Project or Message
objects.

Signed-off-by: Fam Zheng <df9fd617995bad07eac70e27aa3fe5069270e3bd@redhat.com>
Message-Id: <20180307084609.8515-3-df9fd617995bad07eac70e27aa3fe5069270e3bd@redhat.com>
Signed-off-by: Fam Zheng <df9fd617995bad07eac70e27aa3fe5069270e3bd@redhat.com>

patchew-project/patchew,patchew-project/patchew,famz/patchew,famz/patchew,patchew-project/patchew,patchew-project/patchew,famz/patchew,famz/patchew