Added special cases to the friendly name generator to handle
std::shared_ptr and std::unique_ptr as items being held by
collections which are used as data products. This avoids having
an extra underscore be in friendly class name which is not allowed.

This is needed for C++11 (and above) ABI, which is available starting GCC 5.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>

The gcc ABI for C++11 internally uses the namespace std::__cxx11
for the standard library containers. The friendly class name
generator now knows about that naming in order to keep the
branch names the same as before the ABI change.