New handler triggers copying of VIPs from given original cluster to new
one. The reason for separation of this action from copying of network
configuration is that accordion to [1] copying of existing VIPs/allocation
of new ones will not take effect for new cluster unless it has assigned
nodes. Thus in context of cluster upgrade procedure VIP transfer must be
done after node reassignment, and as long as nodes are being operated on
one by one it would be not efficient to call VIP copying method after
each such reassignment.
Tests updated accordingly.
[1]: https://review.openstack.org/#/c/284841/
Change-Id: I33670e8f2561be6fe18cec75bfc7ecc056ae2f6b
Closes-Bug: #1552744
c0876c580e