Fix resolving typedef of templates which is from different namespace
and there was 'using' used for it.
Examples are in tests.
Another step to bring code completion for stl containters.

Task-number: QTCREATORBUG-7978

Change-Id: I2e9e71b45d60536c1e25cf2d371c4719b15edf79
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>