Michael Friedrich 5812dae55b Dev: Allow to delay main worker process in order to attach with LLDB
Introduce `-DInternal.DebugWorkerDelay=120` and sleep inside `RunWorker()`.

Rationale: With 2.11 we've introduced a real umbrella process where the
main process is spawned as child fork. Running icinga2 in foreground on
a macOS shell with LLDB will now exit, and not follow the child process.

LLDB doesn't support `follow-fork-mode child` like GDB and therefore we
need to:

- Print the child process PID
- Sleep for X seconds to allow the developer to run `lldb -p <PID>`, set breakpoints, etc.

This commit also documents all available debug build enabled internal constants.
2020-01-29 13:21:05 +01:00
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