Am probably jumping ahead here. Just tried to test once with all nodes as OVS Managers and one node to handle neutron requests, Faced issue even while stacking.

ODL1->handle neutron
ODL1,ODL2,ODL3 -> OVS Managers
Local.conf: https://gist.github.com/gvranganvtn/42239afc7caece28b3c0

Exception in ODL1
16-02-09 17:18:49,774 | ERROR | n-invoker-impl-0 | apshotBackedReadWriteTransaction | 136 - org.opendaylight.controller.sal-core-spi - 1.3.0.SNAPSHOT | Tx: member-1-chn-411-txn-1 Failed Read of /(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=ovsdb:1}

]/node/node[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)node-id=ovsdb://uuid/7379aa64-0416-45e2-9531-351397cc742a}

]
java.lang.IllegalArgumentException: Metadata not available for modification NodeModification [identifier=(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)manager-entry, modificationType=TOUCH, childModification={(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)manager-entry[

{(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)target=tcp:12.13.14.1:6640}

]=NodeModification [identifier=(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)manager-entry[

{(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)target=tcp:12.13.14.1:6640}

], modificationType=DELETE, childModification={}], (urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)manager-entry[

{(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)target=tcp:12.13.14.2:6640}

]=NodeModification [identifier=(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)manager-entry[

{(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)target=tcp:12.13.14.2:6640}

], modificationType=DELETE, childModification={}], (urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)manager-entry[

{(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)target=tcp:12.13.14.3:6640}

]=NodeModification [identifier=(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)manager-entry[

{(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)target=tcp:12.13.14.3:6640}

], modificationType=DELETE, childModification={}]}]
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145)[64:com.google.guava:18.0.0]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.apply(SchemaAwareApplyOperation.java:197)[80:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.mutateChildren(AbstractNodeContainerModificationStrategy.java:134)[80:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.applyTouch(AbstractNodeContainerModificationStrategy.java:247)[80:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.applyMerge(AbstractNodeContainerModificationStrategy.java:165)[80:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.apply(SchemaAwareApplyOperation.java:206)[80:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.mutateChildren(AbstractNodeContainerModificationStrategy.java:134)[80:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
@

Will attach all logs shorthy