Update build and test slaves to OmniOS r151016

[prakashsurya]

With the release of OmniOS r151016, @danmcd has made the process of building and testing illumos on OmniOS more streamlined. He's detailed these changes in this post to the OpenZFS mailing list here: http://lists.open-zfs.org/pipermail/developer/2015-November/001980.html

We should update the current build and test slave, that are based on OmniOS r151014, to use the new r151016 image and use the new tools that Dan has built. At the very least, moving the builders to using the new tools and process will ensure it is regularly tested, and make sure it continually works as expected.