feature privacy snapshot test

[dimas1185]

Change Description

• added integration test for loading security group from snapshot scenario:
  security group activated in a cluster and then we save snapshot from one of its nodes. After that we restart all nodes from that snapshot and check that participants are still in security group while non-participants continue to not receive new blocks.
  Then we add non participants to group, save snapshot again and restart former non-participant from that snapshot. Now all nodes are in sync and in security group. In this test we ensure that security group remains actual after loading from snapshot and non-participants remain out of security group.

• fix unit tests build after updating to boost 1.76

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