OTTAWA (Reuters) - The Canadian government is eyeing legislation that would let it revoke the citizenship of dual nationals involved in acts of terrorism following news that a Canadian-Lebanese man participated in an attack that killed Israeli tourists in Bulgaria last year. The Conservative government said on Tuesday that a Canadian dual national was one of three people who attacked a tourist bus in Bulgaria last summer, killing five Israelis. Canada is investigating a separate charge by Algeria that a Canadian coordinated last month's attack on a gas plant there. ...