Add test script for sendsparkmany

Author: aleflm

qa/pull-tester/rpc-tests.py

@@ -196,7 +196,8 @@
     'sendmany.py',
     'sendtransparent.py',
     'spendspark.py',
-    'sendspark.py'
+    'sendspark.py',
+    'sendsparkmany.py'
 ]
 # if ENABLE_ZMQ:
 #     testScripts.append('zmq_test.py')