HDFS-15918. Replace deprecated RAND_pseudo_bytes

[GauthamBanasandra]

• RAND_pseudo_bytes is deprecated in OpenSSL
  1.1.1 and must be replaced by RAND_bytes.

[GauthamBanasandra]

This PR fixes the following compilation warning -

[WARNING] /home/jenkins/jenkins-home/workspace/hadoop-multibranch_PR-2792/src/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/sasl_digest_md5.cc:97:74: warning: 'int RAND_pseudo_bytes(unsigned char*, int)' is deprecated [-Wdeprecated-declarations]
[WARNING]                  from /home/jenkins/jenkins-home/workspace/hadoop-multibranch_PR-2792/src/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/sasl_digest_md5.cc:20:
[WARNING] /usr/include/openssl/rand.h:44:1: note: declared here

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 37s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		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	32m 32s		trunk passed
+1 💚	compile	2m 39s		trunk passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
+1 💚	compile	2m 41s		trunk passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
+1 💚	mvnsite	0m 30s		trunk passed
+1 💚	shadedclient	51m 46s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 16s		the patch passed
+1 💚	compile	2m 28s		the patch passed with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04
-1 ❌	cc	2m 28s	/results-compile-cc-hadoop-hdfs-project_hadoop-hdfs-native-client-jdkUbuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04.txt	hadoop-hdfs-project_hadoop-hdfs-native-client-jdkUbuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 with JDK Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 generated 7 new + 80 unchanged - 13 fixed = 87 total (was 93)
+1 💚	golang	2m 28s		the patch passed
+1 💚	javac	2m 28s		the patch passed
+1 💚	compile	2m 32s		the patch passed with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08
-1 ❌	cc	2m 32s	/results-compile-cc-hadoop-hdfs-project_hadoop-hdfs-native-client-jdkPrivateBuild-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08.txt	hadoop-hdfs-project_hadoop-hdfs-native-client-jdkPrivateBuild-1.8.0_282-8u282-b08-0ubuntu120.04-b08 with JDK Private Build-1.8.0_282-8u282-b08-0ubuntu120.04-b08 generated 3 new + 84 unchanged - 9 fixed = 87 total (was 93)
+1 💚	golang	2m 32s		the patch passed
+1 💚	javac	2m 32s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 19s		the patch passed
+1 💚	shadedclient	13m 12s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	31m 53s		hadoop-hdfs-native-client in the patch passed.
+1 💚	asflicense	0m 33s		The patch does not generate ASF License warnings.
		105m 54s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2811/1/artifact/out/Dockerfile
GITHUB PR	#2811
Optional Tests	dupname asflicense compile cc mvnsite javac unit codespell golang
uname	Linux 3a133aed974d 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 / 936b080
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-2811/1/testReport/
Max. process+thread count	723 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-native-client U: hadoop-hdfs-project/hadoop-hdfs-native-client
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2811/1/console
versions	git=2.25.1 maven=3.6.3
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[GauthamBanasandra]

This PR doesn't modify any existing functionality and thus no extra unit tests are required. The warnings reported in the CI run aren't related to my PR.

[GauthamBanasandra]

This PR fixes the warnings reported as part of #2792 in CI run #2792 (comment)

[WARNING] /home/jenkins/jenkins-home/workspace/hadoop-multibranch_PR-2792/src/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/sasl_digest_md5.cc:97:74: warning: 'int RAND_pseudo_bytes(unsigned char*, int)' is deprecated [-Wdeprecated-declarations]
[WARNING]                  from /home/jenkins/jenkins-home/workspace/hadoop-multibranch_PR-2792/src/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/sasl_digest_md5.cc:20:
[WARNING] /usr/include/openssl/rand.h:44:1: note: declared here