[Rpm-maint] [rpm-software-management/rpm] Possible deadlock when macro tracing and debug is turned on (#1418)

[Michael Schroeder]

This deadlocks for me:
```
rpm -vv --eval '%trace'
```
It hangs because rpmlog() tries to expand `%{?_color_output}^{!?_color_output:auto}` leading to another call to rpmlog().

We could temporarily clear print_expand_trace in the printExpansion() function but I think a better fix would be to revert commit 7f220202f20c69d6f3fd957325cdbe692bbabedd. It's weird that printExpansion() uses rpmlog, but printMacro() does not. Also, the line is printed with multiple rpmlog calls, leading to `D:` being spread into the output.

The commit does not include a rationale, so it's hard to tell why this was changed in the first place.

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