Added working AWS with format disks for lin/win platforms

[sparshev]

In order to build the images for AWS cloud provider the next changes was prepared.

Description

• The jenkins agent scripts was updated to be configurable with hops - when CONFIG_URL is found in the config options - the script starts to look at it for the future config data. In case it will find the new CONFIG_URL there it replaces the previous one and so on...
• The disks now could be formatted on VM itself (lin/win) - if it founds the raw disk formatall script formats it as default filesystem. Probably it's better than using fish-formatter, but less controllable. Need to check in the future on the ways of passing the params to the formatter script.
• JENKINS_AGENT_WORKSPACE now is an optional param for the agent - by default it will use the home directory of the user as a workdir.
• Fixed the issue with insecure download of jenkins agent on the win platform - now it restores the security policy of certificate validation if JENKINS_HTTPS_INSECURE option is not set.
• Added a way to specify auth creds for the download role - now we can use auth while downloading artifacts to local machine, the docs are set in README.md

Related Issue

fixes: #3

Motivation and Context

New AWS cloud provider.

How Has This Been Tested?

Manually

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] 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.
• [x] My change requires a change to the documentation.
• [x] 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.