Specialize relative leafref types during instantiation

Specialize relative leafref types during instantiation

leaf of relative leafref type declared in grouping could reference
node outside of it. In such case target node of leafref depends on
location where its origin grouping used. Before property from
relative leafref was calculated from its origin grouping and this
property were used at all GeneratedTypes produced from the
grouping users.

When leafref pointed outside of its origin grouping, Object for leaves,
List<?> for leaf-list were used as property type. Now type resolving is
running from locations, where relative leafref is added by uses and its
ancestors grouping do not add a node at the leafref path.

JIRA: MDSAL-426
JIRA: MDSAL-533
Change-Id: I5004f0579778527511b4b028e00f7ab9c3051731
Signed-off-by: miroslav.kovac <miroslav.kovac@pantheon.tech>
Signed-off-by: Ilya Igushev <illia.ihushev@pantheon.tech>
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>