Misc fixes

[mattiaswal]

Description

• Update texts for some tests for test specification
• Fail build when test specification fails to build
• Add a default NACM rule to OPT-in the view of password HASH , fix #499
• Fix test error if loopback was in multiple area, fix #586
• Add lock to not allow configuration of loopback in multiple areas (was an exception)
• Fix BFD in OSPF, was not possible to enable on just one interface, no one or all interfaces was the way to go.
• Refactor YANG modules, the infix modules are now located in src/confd/yang/infix/ and are split to two, one simple.yang and a symlink to simple@1970-01-01.yang
• Add new issues automatically to the project Infix&Co

Other information

Checklist

Tick relevant boxes, this PR is-a or has-a:

• [x] Bugfix
  • [ ] Regression tests
  • [x] ChangeLog updates (for next release)
• [ ] Feature
  • [ ] YANG model change => revision updated?
  • [ ] Regression tests added?
  • [ ] ChangeLog updates (for next release)
  • [ ] Documentation added?
• [ ] Code style update (formatting, renaming)
• [x] Refactoring (please detail in commit messages)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

[troglobit]

Just a cursory glance tonight, but it looks real good! 💪 I'll give you a proper review tomorrow morning, because I have some minor comments I think you might want to address 👍