check userid in db and migrated
check userid in db and migrated

1. For userid in db, not migrated, in current host, return true
2. For userid in db, migrated, out of current host, return false
3. For userid in db, not migrated, out of current host, mark
   migrated and return false

Change-Id: I766e72d832bbb24b7f324167377a03a71372c14f

mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk