McdDispatcher: construct object paths for clients with "." in their name correctly
McdDispatcher: construct object paths for clients with "." in their name correctly

telepathy-spec explains that, for instance, the client named
o.f.T.C.Empathy._1_42.Window2 has the object path
/o/f/T/C/Empathy/_1_42/Window2.

This patch fixes a crash whenever a Client with such a name is contacted.

freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control