Part of #2456 - GUI bug for attacking specific accounts

at initial conecting, the GUI regard all the accounts with the same address as the accounts in the local wallet and get data accordingly, this provide chance for hacker to attack specific accounts to make it not able to connect, https://bitsharestalk.org/index.php?topic=27613.0 [4d]

Start by reviewing the linked BitShares forum report and tracing the GUI's initial connection and account-matching flow. Confirm how accounts sharing an address are treated and define a safe behavior that prevents a remote account from disrupting local-wallet connectivity; the issue provides no file or test names.

Written by the indexing model from the issue text.