[9] RFR (S): 8155751: Some tests miss othervm for main/bootclasspath mode

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8155751/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8155751

Since 4.2b02 jtreg requires /othervm for bootclasspath mode when 
command-line flags are specified.

Testing: ran affected tests with jtreg 4.2b02.

Thanks!

Best regards,
Vladimir Ivanov

PS: I'll push the fix directly into jdk9/hs once it is reviewed.