(maint) Solaris 11 acceptance fixups

In commit 957db49, @er0ck modified acceptance to temporarily use OpenCSW while we worked to get Solaris 11.2 templates in vmpooler. Now that the work has been completed, this PR reverts that commit, modifies Beaker configs to use the new Solaris 11.2 templates, and maintains use of the `json_pure` gem (to be consistent with Solaris 10).