Fix in fuel cli docmentation required and optional arguments

Registered by Evgeniy L

User expected to see in command help, not only optional arguments, but also required, for example --env.

[root@fuel product]# python fuel_cli_testing deploy -h
usage: fuel [global optional args] deploy [-h]

optional arguments:
  -h, --help show this help message and exit
[root@fuel product]# python fuel_cli_testing health -h
usage: fuel [global optional args] health [-h] [-l] [--check CHECK]

optional arguments:
  -h, --help show this help message and exit
  -l, --list List all available checks
  --check CHECK Run check for some id.

Also in global docs, you can see --env parameter as optional
1. it is not global parameter
2. it is not optional in some cases

[root@fuel product]# python fuel_cli_testing -h
usage: fuel [optional args] <namespace> [action] [flags]

optional arguments:
  -h, --help show this help message and exit
  --env ENV, --env-id ENV
                        environment id

Blueprint information

Status:
Complete
Approver:
Evgeniy L
Priority:
Medium
Drafter:
None
Direction:
Approved
Assignee:
Alexandr Notchenko
Definition:
Approved
Series goal:
Accepted for 4.1.x
Implementation:
Implemented
Milestone target:
milestone icon 4.1
Started by
Alexandr Notchenko
Completed by
Alexandr Notchenko

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