Bug 2327: Handle binary data in NormalizedNode streaming

Bug 2327: Handle binary data in NormalizedNode streaming

Also made optimization improvements to reuse primitive (using valueOf) and coded String
values (using intern) when read from the stream.

Also added a reusable StringBuilder instance for building qnames. After
use, the StringBuilder is cleared via the delete method. This
effectively resets the char count to 0. Previously, the
code used string concatenation which the compiler will translate to use
an imlicit StringBuilder. These changes avoid the implicit creation of a
StringBuilder instance each time which should reduce object churn.

Change-Id: Ic9c745d97d1b5eed2dd24bc5d252d05ac1355cbb
Signed-off-by: tpantelis <tpanteli@brocade.com>