Do not use SchemaNodeIdentifierBuildNamespace prerequisites
Incremental lookups on ChildSchemaNodeNamespace allow us to react
to childen being created, hence we do not have an assumption that
the target node must be instantiated by someone else (like eager
instantiation).
This will also allow us better recovery if the target node is not
going to appear due to being disabled by if-feature.
JIRA: YANGTOOLS-694
Change-Id: Ibc05e18037bb85d42ed7123293e7f83f896aad5d
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit
509988128ed9d5fe314a14906114f53778200e47)