Added Security Features

• Breaking Changes
  • Removed Record.Duplicates and GenerationPolicy/DUPLICATE
• New Features
  • Added Security Features: Please consult Security Docs on Aerospike website.
    • ClientPolicy.User, ClientPolicy.Password
    • Client.CreateUser(), Client.DropUser(), Client.ChangePassword()
    • Client.GrantRoles(), Client.RevokeRoles(), Client.ReplaceRoles()
    • Client.QueryUser(), Client.QueryUsers
  • Added Client.QueryNode()
  • Added ClientPolicy.TendInterval
• Improvements
  • Cleaned up Scan/Query/Recordset concurrent code
• Fixes
  • Fixed a bug in tools/cli/cli.go.
  • Fixed a bug when GetHeaderOp() would always translate into GetOp()