BUG-1382: eliminate QName.getPrefix() from GeneratorImpl.xtend

Change-Id: Ie5fdaf7fc7389c13af8aa591bf9531ed26cb11a9
Signed-off-by: Martin Vitez <mvitez@cisco.com>
Merge "BUG-1382: eliminate QName.getPrefix() from GeneratorImpl.xtend"