channel: reset tls state when client calls connect
channel: reset tls state when client calls connect

The channel TLS state is kept during disconnection and reset, for
automatic reconnection and migrations reasons. However, when
spice_channel_connect() is called by client, it should first try
non-TLS connection.

fgouget/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,elmarco/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,Fantu/spice-gtk,SPICE/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,flexVDI/spice-gtk,guodong/spice-gtk,elmarco/spice-gtk,Fantu/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk,Fantu/spice-gtk,Fantu/spice-gtk,SPICE/spice-gtk,elmarco/spice-gtk,guodong/spice-gtk,guodong/spice-gtk,flexVDI/spice-gtk,guodong/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,elmarco/spice-gtk