tools: add valgrind suppression file for libocci

Add a suppression file that essentially squelches everythin inside
libclntsh, libclntshcore and libnnz12.  Acerbic comments about the
quality of Oracle's C++ driver are in order.
src: CONTAINER_OF-ize ConnectBaton
src: CONTAINER_OF-ize ConnectionBaton
src: CONTAINER_OF-ize ConnectionPoolBaton
src: CONTAINER_OF-ize ExecuteBaton
src: CONTAINER_OF-ize ReaderBaton
src: CONTAINER_OF-ize StatementBaton
src: embed NanCallback in ConnectBaton, don't new
src: deduplicate ExecuteBaton constructors
src: pass values array by value
src: fix memory leak in callback-less close() methods
src: RAII-ify refcount management