HDFS-15950. Remove unused hdfs.proto import

[GauthamBanasandra]

• hdfs.proto is imported in inotify.proto
  and is unused. Thus, removing it.

[GauthamBanasandra]

This PR fixes a warning reported in PR #2792.

inotify.proto:35:1: warning: Import hdfs.proto is unused.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	20m 56s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	buf	0m 1s		buf was not available.
+0 🆗	codespell	0m 1s		codespell 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	34m 51s		trunk passed
+1 💚	compile	1m 0s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	0m 49s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	mvnsite	0m 56s		trunk passed
+1 💚	shadedclient	53m 45s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 48s		the patch passed
+1 💚	compile	0m 52s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	cc	0m 52s		the patch passed
+1 💚	javac	0m 52s		the patch passed
+1 💚	compile	0m 43s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	cc	0m 43s		the patch passed
+1 💚	javac	0m 43s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 46s		the patch passed
+1 💚	shadedclient	16m 4s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 15s		hadoop-hdfs-client in the patch passed.
+1 💚	asflicense	0m 29s		The patch does not generate ASF License warnings.
		98m 23s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2858/1/artifact/out/Dockerfile
GITHUB PR	#2858
Optional Tests	dupname asflicense compile cc mvnsite javac unit buflint bufcompat codespell
uname	Linux 5bd2823b76f8 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / d2ccebe
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2858/1/testReport/
Max. process+thread count	514 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client U: hadoop-hdfs-project/hadoop-hdfs-client
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2858/1/console
versions	git=2.25.1 maven=3.6.3
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