Add static ArgumentUtils XPath integration
YANG parser needs to interpret when/must expressions so that they
can be used by downstreams in their effective view.
We add static binding of rfc7950.stmt to an implementation of
YangXPathParserFactory. This makes it clear we do not need to
actually store URIs to make things useful, hence we deprecate
URIStringToImportPrefix namespace.
JIRA: YANGTOOLS-966
Change-Id: Iaf771ad5e0bcdd058fe537ed67d5c9e4e6556e81
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit
74ce3034bd665b107918ca25693760d6aa629ef9)