report.node does sabotage serialization (affects pytest-html, possibly reportlog)

[RonnyPfannschmidt]

we should figure a acceptable serialization

a initial idea is to put it in as something like

{"gateway": { "id" : node.gateway.id, "spec": node.gateway.spec}}

refs

• pytest-dev/pytest-html#591
• pytest-dev/pytest-html#592
• pytest-dev/pytest-html#593

[RonnyPfannschmidt]

additional refs https://github.com/pytest-dev/pytest-reportlog/issues/5 https://github.com/pytest-dev/pytest-reportlog/pulls/35