[PATCH 4/7] dbus: Add a Group property to Peer object which will hold its group path

[Tomasz Bursztyka]

Hi Jouni,

> As noted in the previous emails, this may not be unique, i.e., there
> could be multiple matching interfaces since P2P supports multiple
> groups. Is it acceptable for this interface to support properly only the
> case of a single group being in use (and have undefined behavior on
> group selection if more than a single group is in place between the two
> P2P Devices)?

Let's change this interface from Group to Groups, a list of group object 
path.
Thus it will fit in all case, multi group or not

Tomasz