Implement client API for launcher adding process to supplementary groups

Implement client API for launcher adding process to supplementary groups

In Tizen some sensitive resources are being accessed by applications
directly. The resources, being file system objects, are owned by
dedicated GIDs and only processes in those UNIX groups can access them.
This function should be used by application launcher for adding
application process to all permitted groups that are assigned to such
privileges.

Change-Id: I608d84e77869378b28c4130443323143b71380c4
Signed-off-by: Rafal Krypa <r.krypa@samsung.com>