[cli] 'murano package-create' optional paramter is required

[Sergey Murashov]

Steps to reproduce:
1. Install murano pythonclient
2. Execute 'murano package-create --classes-dir Classes --resources-dir Resources -f somefqn --name nameofpackage

Actual result:
We get "'--ui' is required parameter", but if we execute 'murano help package-create', we get the following message:

user@ubuntu:~/tempest/tempest/cli/simple_read_only$ murano help package-create
usage: murano package-create [-t <HEAT_TEMPLATE>] [-c <CLASSES_DIRECTORY>]
                             [-r <RESOURCES_DIRECTORY>] [-n <DISPLAY_NAME>]
                             [-f <full-name>] [-a <AUTHOR>]
                             [--tags [<TAG1 TAG2> [<TAG1 TAG2> ...]]]
                             [-d <DESCRIPTION>] [-o <PACKAGE_NAME>]
                             [-u <UI_DEFINITION>] [--type TYPE] [-l <LOGO>]

Create an application package.

Optional arguments:
  -t <HEAT_TEMPLATE>, --template <HEAT_TEMPLATE>
                        Path to the Heat template to import as an Application
                        Definition
  -c <CLASSES_DIRECTORY>, --classes-dir <CLASSES_DIRECTORY>
                        Path to the directory containing application classes
  -r <RESOURCES_DIRECTORY>, --resources-dir <RESOURCES_DIRECTORY>
                        Path to the directory containing application resources
  -n <DISPLAY_NAME>, --name <DISPLAY_NAME>
                        Display name of the Application in Catalog
  -f <full-name>, --full-name <full-name>
                        Fully-qualified name of the Application in Catalog
  -a <AUTHOR>, --author <AUTHOR>
                        Name of the publisher
  --tags [<TAG1 TAG2> [<TAG1 TAG2> ...]]
                        List of keywords connected to the application
  -d <DESCRIPTION>, --description <DESCRIPTION>
                        Detailed description for the Application in Catalog
  -o <PACKAGE_NAME>, --output <PACKAGE_NAME>
                        The name of the output file archive to save locally
  -u <UI_DEFINITION>, --ui <UI_DEFINITION>
                        Dynamic UI form definition
  --type TYPE Package type. Possible values: Application or Library
  -l <LOGO>, --logo <LOGO>
                        Path to the package logo

Where '--ui' is a optional parameter

[Ekaterina Chernova (efedorova)]

This is an expected behavior. This parameter became required only with regular type of package. Since we don't know in advance, what package type will be created - this parameter is displayed as optional