cfg: add electromagnet test cfg

cfg/electromagnet_test_cfg.py

@@ -0,0 +1,16 @@
+Node('electromagnet_test.test',
+     'test electromagnet SPS',
+     'tcp://5000',
+     )
+
+Mod('io',
+    'frappy_psi.electromagnet.IO',
+    'electromagnet communication',
+    uri='linse-apu5:2000',
+    )
+
+Mod('EM',
+    'frappy_psi.electromagnet.Magnet'
+    '',
+    '',
+    io='io')