noux: avoid 'no attachment at 0' messages

binary_ds cap is attempted to free up twice by
_root_dir->release(_name, _binary_ds) in ~Child de-constructor and by
Static_dataspace_info _binary_ds_info de-constructor.

This commit keeps all binary related information inside a struct which gets
freed up after all noux session book keep cleaning is done.

Issue #485
noux: implement some libc dummy function

and quieten some noisy messages in non-verbose mode

Issue #485
nova: speed up cap selector allocation

Issue #485