posix wrapper should be silent on success

[elfenpiff]

Brief feature description

The posix wrapper for the shared memory prints a lot of debug information when it was created successfully. On success a posix wrapper should always be silent so that the user can decide what to print and what not - if the wrapper does it for the user it is hard to turn it of.

Remove all the outputs from the shared memory object which are printed on success and move them in the implementation which is using the shared memory object.