Add javadocs for message states.

3 jobs for !1471 with 1802-defer-delivery in 10 minutes and 11 seconds (queued for 15 seconds)
latest detached
Status Job ID Name Coverage
  Test
passed #10051
test

00:10:11

 
  Optional Tests
manual #10052
kvm allowed to fail manual
android test
manual #10053
allowed to fail manual
bridge test