RFR(s): 8166553: undeclared dependencies for two IO tests

[Sergei Kovalev]

Hello team,

Please review very small fix for two regression tests.

BugID: https://bugs.openjdk.java.net/browse/JDK-8166553
Webrev: http://cr.openjdk.java.net/~skovalev/8166553/webrev.00/

Issue: tests failing in case of "--limit-modules java.base" command line 
option of vm.
Root cause: undeclared dependencies on jdk modules.
Solution: added declaration of required modules into jtreg header.

-- 
With best regards,
Sergei