python/semanage: fix export of fcontext socket entries

Fixes https://github.com/SELinuxProject/selinux/issues/49 (#49).

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

python/semanage/seobject.py

@@ -84,7 +84,7 @@ file_type_str_to_option = {"all files": "a",
                            "directory": "d",
                            "character device": "c",
                            "block device": "b",
-                           "socket file": "s",
+                           "socket": "s",
                            "symbolic link": "l",
                            "named pipe": "p"}