Make Roster entries Map from BareJid to RosterEntry, since only
bare JIDs are allowed as roster items as per RFC 6121 § 3.1.1
When a user sends a presence subscription request to a potential
instant messaging and presence contact, the value of the 'to'
attribute MUST be a bare JID <contact@domainpart> rather than a full
JID <contact@domainpart/resourcepart>,…
Also some further Roster API changes regarding JIDs.
Roster's INSTANCE map has a weak reference to XMPPConnection, which has
a field of RosterEntry(ies), and RosterEntry has a strong reference to
XMPPConnection resulting in a cycle which is preventing XMPPConnection
from getting gc'ed.
SMACK-659.
Use final where possible, add javadoc. Fix duplicate comment in
Roster.
Use createPacketCollectorAndSend(packet).nextResultOrThrow when
possible, and only set the entry name if the IQ set is successful.
