Add support for NetBox 2.10

[mzbroch]

NetBox onboarding plugin v2.0 supports following NetBox releases: 2.8 and 2.9.

This issue will be used to track progress of adding support for NetBox 2.10 release to the onboarding plugin.

[nniehoff]

This is being worked in PR #119

[mzbroch]

Merged in #119