Help text for events-list options does not follow common format

[Naoya Harada]

events-list command's help text for --id, --resource-id, --resource_state,
--resource_type, and --event_type does not follow common format.

  $ tacker help events-list
  usage: tacker events-list [-h] [-f {csv,json,table,value,yaml}] [-c COLUMN]
                            [--max-width <integer>] [--noindent]
                            [--quote {all,minimal,none,nonnumeric}]
                            [--request-format {json,xml}] [-D] [-F FIELD]

  List events that belong to a given resource. The supported args are --id,
  --resource_id, --resource_state, --resource_type, --event_type

  optional arguments:
    -h, --help show this help message and exit
    --request-format {json,xml}
                          The xml or json request format
    -D, --show-details Show detailed info
    -F FIELD, --field FIELD
                          Specify the field(s) to be returned by server. You can
                          repeat this option.

  output formatters:
  ...

Generally, options are shown in 'usage' and also listed with detail description in 'optional arguments'.
Also, vnf-events-list, vnfd-events-list, and vim-events-list have similar issues.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-tackerclient 0.9.0 release.