Update ZFS 0.6.0-rc13-1 with Kernel 3.7.2
Update ZFS to 0.6.0_rc13_3.7.3-1
Merge branch '0.6.0-rc13-3.7.X'

Update ZFS to 0.6.0-rc13-3.7.3-1. Kernel 3.7.3-1 is now in core.