HADOOP-19753 Support HADOOP_LOG_DAEMON_MODE environment variable

[boqiang]

Description of PR

Support a new environment variable HADOOP_LOG_DAEMON_MODE to allow dynamically setting HADOOP_ROOT_LOGGER and HADOOP_LOGFILE to same values as if using --daemon option to run hadoop services

hadoop systemd services run the daemon process in the forground without using --daemon option. However, HADOOP_ROOT_LOGGER and HADOOP_LOGFILE values will only be set dynamically when using --daemon flag. For systemd services, we want to have same default settings for HADOOP_ROOT_LOGGER and HADOOP_LOGFILE as the background daemon case.

How was this patch tested?

This feature has been tested on workday real production environment.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	15m 30s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	shelldocs	0m 0s		Shelldocs was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
+1 💚	mvninstall	37m 12s		trunk passed
+1 💚	mvnsite	1m 37s		trunk passed
+1 💚	shadedclient	25m 19s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 9s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 28s		the patch passed
+1 💚	shellcheck	0m 3s		No new issues.
+1 💚	shadedclient	25m 5s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	1m 47s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 36s		The patch does not generate ASF License warnings.
		113m 0s

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8129/1/artifact/out/Dockerfile
GITHUB PR	#8129
Optional Tests	dupname asflicense mvnsite unit codespell detsecrets shellcheck shelldocs
uname	Linux 79428fcbbda8 5.15.0-156-generic #166-Ubuntu SMP Sat Aug 9 00:02:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 2ac5275
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8129/1/testReport/
Max. process+thread count	635 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8129/1/console
versions	git=2.25.1 maven=3.9.11 shellcheck=0.7.0
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