BUG-1270: expose QName.create(QNameModule, String)

We have had the constructor to go with this a long time ago, expose it
via a static factory method.

Change-Id: If198764ba51ada19527b484b420ad843236fbcf3
Signed-off-by: Robert Varga <rovarga@cisco.com>
BUG-1270: use QNameModule where possible

This converts a couple of callsites, which will hopefully result in more
sharing.

Change-Id: If77948d6cf16b56d3d05eeb5a6dc37d20b0ab1ae
Signed-off-by: Robert Varga <rovarga@cisco.com>