net_plugin fix for privacy groups corner case

[dimas1185]

Change Description

Fixed test case that required node restart in privacy_scenario_3_test.py

Scenario:
after node1 launched it sends handshake to node2
node1 is not in security group so node2 doesn't send back any notice (lib catchup notice was required in that case)
node1 was added to security group and node2 sends to node1 handshake
in sync 1 scenario, when net_plugin receives non-first handshake with lib greater its own lib it do nothing.
This fix adds sending handshake there also in case of non-first handshake generation

Change Type

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Testing Changes

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Consensus Changes

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API Changes

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[brianjohnson5972]

I'd also like Kevin to look at this.