tools: print tracebacks to the same stream as delimiters

Error output is currently a garbled mess, delimiters are printed with
poutput() or print(), traceback with traceback.print_exc() which goes
to stderr.

Reading stdout alone omits the report but not -->8-- lines.
Reading both streams makes the traceback appear where the two buffers
just happen to interleave, stderr is usually unbuffered but stdout is
not, so I get the error trace, APDU trace, then empty -->8-- lines.

Fix this by aligning the printing funcs.

Change-Id: I2ed37dfe241d014e4a26894cddbc9b21be1fd0c2

pySim-prog.py

@@ -816,7 +816,7 @@ if __name__ == '__main__':
             print("")
             print("Card programming failed with an exception:")
             print("---------------------8<---------------------")
-            traceback.print_exc()
+            print(traceback.format_exc().rstrip())
             print("---------------------8<---------------------")
             print("")
             rc = -1