uwrap: Big changes.

This is result of my uid_wrapper session. This will need slice to
smaller pieces and send to upstream for review. God help me...

Signed-off-by: Robin Hack <hack.robin@gmail.com>
Signed-off-by: Robin Hack <rhack@redhat.com>
Merge branch 'master' of github.com:marmolak/uid_wrapper

Signed-off-by: Robin Hack <hack.robin@gmail.com>

Conflicts:
	tests/test_glibc_thread_support.c