Address doesn't update if Bob changes address

[silkroadnomad]

After a simple address change for both parties Alice and Bob the address update of Bob doesn't update Alice address book.
But if Alice updates her address, Bob's address book is updated.

1. extend test suite with test where Bob updates his address.
2. extend test suite with test where Alice updates her address.

[silkroadnomad]

@davidreband if you test this manually it works normally. Alice can update her address and it will be updated in Bobs address book too and vice verca. Double check of tests needed!