Do not call lcb_server_send_packets() for each relocated packet

This function will be called per-server after relocation

Change-Id: Ieee91013c02d65d5fc484a63038572d2ba280d72
Fix defaults for LCB_DURABILITY_INTERVAL in man

Change-Id: If483f18f9762ef681616a0b77ae1236a86a2049f
Update meta for release 2.1.0

Change-Id: I495e1037332fada0efdb9a3b88bb72a17c796059