[C++] Removing 'using' statements from includes

[Jean-Sebastien Delfino]

When refactoring the tuscany/sca/util classes, I noticed a number of 
'using namespace xyz' statements in some of our header files. I believe 
C++ practice is to avoid 'using' statements in a header file as they 
impact all cpp files that include the header and can cause name clashes. 
I think I contributed to adding some of these 'using' statements so I'm 
going to make some changes to our headers to help clean this :)

--
Jean-Sebastien

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