CSI active/inactive should be sent after complete XMPP handshake

[daniele-athome]

First of all, this is causing a crash:

java.lang.IllegalArgumentException: Client State Indication not supported by server
       at org.jivesoftware.smackx.csi.ClientStateIndicationManager.throwIaeIfNotSupported(ClientStateIndicationManager.java:46)
       at org.jivesoftware.smackx.csi.ClientStateIndicationManager.inactive(ClientStateIndicationManager.java:36)
       at org.kontalk.service.msgcenter.MessageCenterService.inactive(MessageCenterService.java:1664)
       at org.kontalk.service.msgcenter.MessageCenterService$IdleConnectionHandler.forceInactive(MessageCenterService.java:598)
       at org.kontalk.service.msgcenter.MessageCenterService$2.onReceive(MessageCenterService.java:630)

This can also lead to a packet being sent while handshaking SSL, which is bad.