RFR JDK-8236044 Create jdk_accessibility test group

[Alexandre (Shura) Iline]

Hi.

Can you please take a look on this minor change.

Bug: https://bugs.openjdk.java.net/browse/JDK-8236044
Webrev: http://cr.openjdk.java.net/~shurailine/JDK-8236044/webrev.00/

Shura