GH-195: using form param instead of data

[luckyluke-adobe]

This PR changes the pipe client script to use multipart form data and replaces the current -d data option

Description

The change is necessary because in curl it's not possible to mix the data (-d) option with multipart form (-f) The script is changed at only one place.

Related Issue

see issue Description GH-195

Motivation and Context

How Has This Been Tested?

it has been tested by executing some example pipe commands locally.

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[npeltier]

lgtm thanks @luckyluke-adobe