Don't include default values in option descriptions since they are echoed by default

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      Some tool options include default values in their descriptions which are also echoed by default, leading to duplication and possible confusion.

      For example:

      $ mongoexport --help | grep -i default
      --gssapiServiceName=<service-name>          service name to use when authenticating using GSSAPI/Kerberos ('mongodb' by default)
      --gssapiHostName=<host-name>                hostname to use when authenticating using GSSAPI/Kerberos (remote server's address by default)
      --type=<type>                               the output format, either json or csv (defaults to 'json') (default: json)
  -k, --slaveOk                                   allow secondary reads if available (default true) (default: false)
      --assertExists                              if specified, export fails if the collection does not exist (default: false)

            Assignee:
            Tim Fogarty (Inactive)
            Reporter:
            Stennie Steneker (Inactive)
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              Created:
              Updated:
              Resolved: