separate test_rpc from all_tests

nimbus.nimble

@@ -31,6 +31,7 @@ proc test(name: string, lang = "c") =
 
 task test, "Run tests":
   test "all_tests"
+  test "test_rpc"
   # debugging tools don't yet have tests
   # but they should be compilable
   exec "nim c premix/premix"

tests/all_tests.nim

@@ -16,7 +16,7 @@ import  ./test_code_stream,
         ./test_generalstate_json,
         ./test_tracer_json,
         ./test_persistblock_json,
-        ./test_rpc,
+        #./test_rpc, # it crash if we combine it here
         ./test_op_arith,
         ./test_op_bit,
         ./test_op_env,