Implementing refinements in the webui: dividing forms for selecting the context and uploading json files in the home page; listing and detailing existing services.

- Each device type has a particular icon
- Icon color represents real/emulated devices
- Nodes support drag/drop
- Nodes are auto-placed in the topology
- Nodes have a tooltip showing their name/id

- Added upload of descriptors file
- Added scripts to generate descriptor files
- Arranged minor script details
- Minor bug fixing

Merge branch 'feat/device-openconfig' of https://gitlab.com/teraflow-h2020/controller into feat/webui

Device OpenConfig Driver:
- add missing template
- implement filter to avoid sending empty edit-config requests

Service L3NM-Emulated ServiceHandler:
- implement missing rule to configure routing tables in packet devices

Service L3NM-OpenConfig ServiceHandler:
- implement missing rule to configure routing tables in packet devices

Monitoring:
Reduced default sampling rate to adapt to Infinera devices

Clarifications and corrections applied to release v1

See merge request teraflow-h2020/controller!96

Post-release arrangements:

See merge request teraflow-h2020/controller!95

Release v1.0.0

See merge request teraflow-h2020/controller!94

Cleanup and addition of license headers to files

See merge request teraflow-h2020/controller!93

Resolved some Device OpenConfigDriver issues

See merge request teraflow-h2020/controller!92

Feat/add ztp add bind and serializer

See merge request teraflow-h2020/controller!82

ci(automation): fix deployment job

See merge request teraflow-h2020/controller!91

fix(policy): change policy component service to ClusterIP

See merge request teraflow-h2020/controller!90

Fix multiple issues related to integration of components and cleanup

See merge request teraflow-h2020/controller!89