Add ability to specify manifest file for package-create command

[Sergey Kraynev]

Currently "package-create" command provide ability to specify several option like:

  -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> ...]]
                        A 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.
   --type TYPE Package type. Possible values: Application or Library.
  -l <LOGO>, --logo <LOGO>
                        Path to the package logo.

Most part of these options are already specified in manifest.yaml for package. And it's required file for creation new package.
Will be really useful to have ability specify existing manifest file instead of creation new one.

p.s. also IMO will be good to leave option to specify some other properties, which will overwrite some info in existing manifest