This will reduce traffic by limiting the variety of different caps version hashes.
It might also improve privacy by not leaking fdroid vs playstore vs self build information

* we still include DNS servers from VPNs because of edge cases where the XMPP server is hosted in the VPN
* on older Android versions we don’t know if a network is active or not (activeNetwork == null)

fixes #3465

during live messages we only store the bare real jid; on muc catch up we might get the full jid
for that reason we only compare bare jids