Add raft tick configuration parameters

This commit replaces defaultRaftTick constant with configurable hive
config parameters.

Change-Id: I6095dc1af015db8f21c85148a8555e0db10e1227
Retry in migration test

It is possible that during a migration another follower bee becomes a
master. This commit adds a retry logic in the test case for unsuccessful
migrations.

Change-Id: I364c4a75e6880c2014e3c2d4946b864bc5508a4d
Add retries when requesting hive ID from peers

Change-Id: Ibe83ac43daca5eb71652950a0b24f701db8238ee