test: add testcfg.py to test/abort/

`python tools/test.py abort` won't work without one.

PR-URL: https://github.com/nodejs/node/pull/6734
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/abort/testcfg.py

@@ -0,0 +1,6 @@
+import sys, os
+sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
+import testpy
+
+def GetConfiguration(context, root):
+  return testpy.SimpleTestConfiguration(context, root, 'abort')