[10] RFR JDK-8194229: tools/jmod/JmodTest.jtr fails when no privilege to create sym link on windows

[mandy chung]

This is a simple test-only fix. IOException may be thrown when
a symlink is failed to create on windows. The test should handle
such case in addition to UOE.

Webrev at:
http://cr.openjdk.java.net/~mchung/jdk10/webrevs/8194229/webrev.00/

Mandy