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4, comment out outdated tests
this online_pmids function also required in other service function such as HandleGet, DoGetForNodeDownResponse and etc. which don't have the access to close_node_change for churn object.

If the close_node_change and routing can provide a same api : list of currently connected nodes,
then this online_pmids function can be consistent taking a list of connected nodes.