HBASE-29733 Use ServerName instead of hostname in unloadRegions log message

[jcongithub]

UnloadRegions log message uses the hostname to show where regions are unloading from. When a host runs multiple region servers, the hostname in the log message alone is insufficient to identify which specific region server is unloading regions.

This PR has the change to use ServerName in the log, making it easier to distinguish between region servers on the same host similar to loadRegions log message.

This PR also fixes a log statement

[chandrasekhar-188k]

LGTM

[PDavid]

Hi @jcongithub,

Thanks for your contribution.
Can you please add the Jira ticket ID to the commit message - e.g. use the commit message format documented here:
https://hbase.apache.org/book.html#hbase.commit.msg.format

Please also update the PR title to start with the Jira ticket ID.

[jcongithub]

Thanks @PDavid
Updated

[Apache-HBase]

💔 -1 overall

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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 34s		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.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	hbaseanti	0m 0s		Patch does not have any anti-patterns.
			_ master Compile Tests _
+1 💚	mvninstall	4m 1s		master passed
+1 💚	compile	3m 22s		master passed
+1 💚	checkstyle	1m 1s		master passed
+1 💚	spotbugs	1m 41s		master passed
+1 💚	spotless	0m 49s		branch has no errors when running spotless:check.
			_ Patch Compile Tests _
+1 💚	mvninstall	2m 57s		the patch passed
+1 💚	compile	3m 19s		the patch passed
+1 💚	javac	3m 19s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 0s		the patch passed
+1 💚	spotbugs	1m 40s		the patch passed
+1 💚	hadoopcheck	11m 25s		Patch does not cause any errors with Hadoop 3.3.6 3.4.1.
+1 💚	spotless	0m 44s		patch has no errors when running spotless:check.
			_ Other Tests _
+1 💚	asflicense	0m 11s		The patch does not generate ASF License warnings.
		40m 36s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7487/3/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#7487
Optional Tests	dupname asflicense javac spotbugs checkstyle codespell detsecrets compile hadoopcheck hbaseanti spotless
uname	Linux 61b7dade46ee 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 3b4b0cb
Default Java	Eclipse Adoptium-17.0.11+9
Max. process+thread count	83 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7487/3/console
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[Kota-SH]

LGTM