core: Fix Live Merge recovery with JSON-RPC hosts

JSON-RPC calls to the reconcileVolumeChain verb were not done correctly,
causing recovery to fail if live merge was interrupted by e.g. host
shutdown during the merge operation.

Change-Id: If1b23580ae6023754d2e02000dc5913262b3ef8b
Bug-Url: https://bugzilla.redhat.com/1161127
Signed-off-by: Greg Padgett <gpadgett@redhat.com>