- Leftover cosmetic changes from merge request

-Code cleanup

- Pre-merge clean-up

- Add topology icons for CLIENT and EMULATED_CLIENT device types

- Remove incorrect topology icons

- Correct debug-api endpoint URLs
- Add dummy_contexts endpoint

- Added icons for client laptops

- Added Link Attributes to Details page
- Added formatting of Schedule Constraints in Service and Slice Details page

- deactivated unstable code
- corrected service template

1) Bug fixes
2) L2VPN CLI configuration support for CISCO devices
3) Improved creation of services in WebUI

- Code cleanup

- Code cleanup

- Added gNMI OpenConfig Driver

2) Support to choose between "Jinja" and "pyangbind".
3) WebUI modification for creating services
4) Changes in ConfigRules multivendor to adapt to new features

- Corrected copyright footer

- Added field Controller to Device details

- Corrected issue with policy tab

- Minor code cleanup before merging

- Added fields in load generator tab to filter src/dst candidate device and endpoint