[#MDSAL-534] WriteOperations.mergeParentStructure{Merge,Put} fails on top-level paths

WriteOperations.mergeParentStructure{Merge,Put} provide legacy methods which are supposed to ensure creation on intermediate nodes between the specified target and root of the datastore.

When the path presented to these methods is a single component such that its YangInstanceIdentifier.size() == 1, BindingDOMWriteTransactionAdapter ends up doing the wrong thing, causing a datastore failure:

org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaValidationFailedException: Child /(urn:ietf:params:xml:ns:netconf:base:1.0)data is not present in schema tree.
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeModification.resolveModificationFor(InMemoryDataTreeModification.java:182)
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeModification.merge(InMemoryDataTreeModification.java:102)
	at org.opendaylight.mdsal.dom.spi.store.SnapshotBackedWriteTransaction.merge(SnapshotBackedWriteTransaction.java:92)
	at org.opendaylight.mdsal.dom.broker.DOMForwardedWriteTransaction.merge(DOMForwardedWriteTransaction.java:100)
	at org.opendaylight.mdsal.binding.dom.adapter.BindingDOMWriteTransactionAdapter.ensureParentsByMerge(BindingDOMWriteTransactionAdapter.java:92)
	at org.opendaylight.mdsal.binding.dom.adapter.BindingDOMWriteTransactionAdapter.mergeParentStructurePut(BindingDOMWriteTransactionAdapter.java:42)

While the caller should not do this (javadoc advises to steer clear of these methods unless necessary), it should behave like a no-op.

[MDSAL-534] WriteOperations.mergeParentStructure{Merge,Put} fails on top-level paths Created: 08/Apr/20 Updated: 08/Apr/20 Resolved: 08/Apr/20
Status:	Resolved
Project:	mdsal
Component/s:	Binding runtime
Affects Version/s:	None
Fix Version/s:	6.0.0, 5.0.10, 4.0.14

[MDSAL-534] WriteOperations.mergeParentStructure{Merge,Put} fails on top-level paths Created: 08/Apr/20 Updated: 08/Apr/20 Resolved: 08/Apr/20