hooks: add support for lupin

1. move  root mountpoint from /target/host to /target/deepinhost
2. mount /isodevice to /host & /target/host
3. format loop file
4. generate fstab for lupin installer
5. add casper script to set installer auto run

Change-Id: I1fbac7f1249311ca6f76c6039ef67fa9783c0183