all: Update all scenarios with new fragments and new workflow

[marcelmamula]

Description

PR continues from #55, by:

• All scenario extravars are split into fragments
  • _base that contains scenario specific variables
  • _spec that contains host specification
• Playbook is updated to:
  • Include new interactive mode from all: Add fragments with Interactive prompts, platform images and vars #57
  • Simplify var lookup to reduce long lines and reuse them
  • Move some functionality from sap_vm_provision to playbook to reduce dependencies and enable existing_hosts
• Replaced hana and swpm dictionaries (sap_swpm_templates_install_dictionary) with one common for both sap_software_install_dictionary in order to simplify playbooks
  • Move wildcards into sap_software_install_dictionary
  • Move distributed system entries one level lower so we can make lookup easier - all will be under product, not product+group
• Added comments to all variables in extravars files

All files are getting proper review with Ansible Lint without all ignores we currently have.

Redesign details

Changes are based on #45

[sean-freeman]

Verified code, lgtm 👍

[sean-freeman]

Final commits look good to me 👍