[bind10-dev] Avoid "using namespace" in headers

[Mukund Sivaraman]

Hi all

We should avoid the "using namespace" and "using" statements in header
files. These statements import the names into all C++ files that include
it (even transitively). We have identically named classes in different
namespaces in the tree. Ticket #2536 fixes the current tree, and we
should not introduce it further.

"using namespace" can be used normally in C++ code that are not included
such as typical .cc files. In headers, directly qualify symbols with
their namespaces.

		Mukund
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