junboli b0b08cc650 allow '--help' to print subcomands info ...

Currently, we only allow $manila help subcomand to print
subcomands info, if we are using $manila subcomand --help,
it will print all the subcomands info, that is not what we
want, this change is to allow '--help' to print subcomands
info. finally we can see the following comands are equals:

$ manila --help list
$ manila list --help
$ manila help list

Change-Id: I926defd6c5d3b8d87b038e2c63db694b40a88359
Close-bug: #1771097

2018-05-23 10:33:49 +08:00

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