Maid-315_update_data_manager_account_rebase

Based on the work from MAID-304.
1, trim DataManager account
2, update corresponding persona logical due to trimmed account in DM and PM
3, remove un-necessary class, action, etc.
4, comment out outdated tests
Need not to be int, it should be uint. But to be consistant, I will suggest to have uint64 wherever we are talking about chunk size on network. (had a chat with Fraser on this one and we decided to use uint64).