Add functionality to erase members from networks using file backend i…

[dschulz]

The FileDB.cpp was lacking the functionality to actually delete members from networks.
This patch allows to delete the .json files corresponding to members in any given network.

Signed-off-by: Diego Schulz dschulz@gmail.com

[dschulz]

This is only a partial fix. The json files get deleted right away when the DELETE method is issued to the controller api, but the member still appears when querying the member list for the same network. When the daemon is restarted after that, the member disappears, though.

I'm not sure why this is not working as I expected. I can only guess it has something to do with the _memberChanged() function.

@adamierymenko can you please take a quick look and comment on this? Thanks!

[adamierymenko]

This is related to #859

[lpbpu]

@dschulz , the reason why member still appears when DELETE from controller api, just because misuse of DB:get function to get member's config
In FileDB::eraseMember
get(networkId,network);
get(memberId,member);
should changed to
get(networkId,network,memberId,member);