Update Jemmy to version 2.0.0

An update to Jemmy went through yesterday [0], which is currently incompatible with the uitests [1] due to a couple of package name changes and the version going from 1.0.2 to 2.0.0

[0] https://hg.openjdk.java.net/code-tools/jemmy/v3/rev/c1848648774f

[1] https://api.travis-ci.org/v3/job/540890246/log.txt