[TOOLS-1806] Don't include default values in option descriptions since they are echoed by default - MongoDB

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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)

is related to

TOOLS-1772 mongoexport command line help shows multiple inconsistent default values

TOOLS-2001 mongoexport command line help not consistent