refactor(http1): use LOG constant only with tracing #2728

Job	Run time
Verify hyper.h is up to date	1m 15s
semver	18s
Check Style	4s
features	38s
Test with Miri	2m 10s
minimal-versions	29s
Test C API (FFI)	32s
Check MSRV	29s
udeps	24s
Test stable on ubuntu-latest	1m 27s
Test stable on windows-latest	3m 10s
Test stable on macOS-latest	1m 32s
Test beta on ubuntu-latest	1m 25s
Test beta on windows-latest	2m 12s
Test beta on macOS-latest	1m 35s
Test nightly on ubuntu-latest	1m 26s
Test nightly on windows-latest	2m 31s
Test nightly on macOS-latest	1m 47s
Check exposed types	1m 1s
Build docs	20s
CI is green	1s
	24m 46s

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