Fix ShowIsisDatabaseDetail (was #554)

[jmdilly]

Description

Allow multiple adjacencies between nodes

Motivation and Context

With the current parser, when two nodes have multiple adjacencies, only one of them is saved by the parser. This PR fixes that.

Impact (If any)

Discussed in #554. The schema is updated with an Or so it should be backward compatible.

Screenshots:

Checklist:

• [x] I have updated the changelog.
• [ ] I have updated the documentation (If applicable).
• [x] I have added tests to cover my changes (If applicable).
• [x] All new and existing tests passed.
• [ ] All new code passed compilation.

[GerriorL]

Hi @jmdilly sorry for the delay, could you please catch your fork up to the main repo so we can get this merged for you?