RFR: 8205467: javax/management/remote/mandatory/connection/MultiThreadDeadLockTest.java possible deadlock

[Daniil Titov]

Please review a tiny change that adjusts the wait timeout the test uses for "test.timeout.factor" system property.

Please note that a trivial merge with fix [4] that is currently on review [3] will be required. Since issues [2] and [4] describe different problems I decided to not combine these both changes in the single fix.

Testing: Mach5 tests tier1-tier3 successfully passed.

[1] Web rev:  https://cr.openjdk.java.net/~dtitov/8205467/webrev.01/ 
[2] Jira issue:  https://bugs.openjdk.java.net/browse/JDK-8205467 
[3] https://mail.openjdk.java.net/pipermail/serviceability-dev/2020-June/032098.html 
[4] https://bugs.openjdk.java.net/browse/JDK-8227337 

Thank you,
Daniil