RFR JDK-8060161: re-examine sun/nio/cs/Test4200310.sh, test is invalid for modular image

[Xueming Shen]

Alan, I agree that we should just remove this old regression test. It 
does not server an purpose after those jar files are gone.
Please help review.

issue: https://bugs.openjdk.java.net/browse/JDK-8060161
webrev:  http://cr.openjdk.java.net/~sherman/8060161/
-Sherman