OS-2529 grab 'svcs -xv' for zone when provision times out to go along with ptree.
OS-2536 fix issue with errors on adding transition and failed flags by removing first (thanks to OS-2305)
OS-2543 ZFS prefetch should be enabled always and everywhere
OS-1379 don't fail with zonecfg error message when removing a disk that doesn't exist.
OS-2198 fix TypeError on 'null' value for string parameters.
OS-2545 grab kstats for zone when provision fails, before shutting down, to help debugging.
OS-2554 temporarily work around bug in rename() events by adding a 50ms delay after fs.watch() before checking fs.exists()