net/addr/sock: Add classes for generating sockaddrs

This adds classes to generate IP socket information that can be
consumed by `connect()` and `bind()`.

Change-Id: I84c8fc3794d1113877f0f967291317152a0669d5
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/net/addr/sock.cpp b/src/net/addr/sock.cpp
new file mode 100644
index 0000000..9f714cf
--- /dev/null
+++ b/src/net/addr/sock.cpp
@@ -0,0 +1 @@
+#include <stdplus/net/addr/sock.hpp>