RFR of JDK-8170704: java/rmi/activation/Activatable/* tests fails intermittently with "output improperly annotated"

[Hamlin Li]

Would you please review the below patch?

bug: https://bugs.openjdk.java.net/browse/JDK-8170704
webrev: http://cr.openjdk.java.net/~mli/8170704/webrev.00/

* Root Cause:
The issue can be reproduced by adjust sleeping time to smaller values, 
so on busy machine it's possible that the sleeping time is not long 
enough for rmi system to pass myRMI err/out to rmid err/out.
* Solution:
scale timeout by time factor.

Thank you
-Hamlin