Rather than having standards models scattered throughout the repository,
dedicate a namespace, org.opendaylight.netconf.model, and a top-level
directory to hold them.
JIRA: NETCONF-890
Change-Id: I4bc667a3b4977bc00b929e6c03472952f6d3dcad Signed-off-by: Robert Varga <robert.varga@pantheon.tech>