Import samba-4.2.1 as net/samba4.

Samba is the standard Windows interoperability suite of programs
for Linux and Unix.

Samba is Free Software licensed under the GNU General Public License,
the Samba project is a member of the Software Freedom Conservancy.

Since 1992, Samba has provided secure, stable and fast file and
print services for all clients using the SMB/CIFS protocol, such
as all versions of DOS and Windows, OS/2, Linux and many others.

Samba is an important component to seamlessly integrate Linux/Unix
Servers and Desktops into Active Directory environments. It can
function both as a domain controller or as a regular domain member.

This package tracks 4.x branch release.

(ryoon)