HADOOP-17508. Simplify deps install instructions

[GauthamBanasandra]

• Simplified the installation instructions for
  Protocol buffers and Boost.

[GauthamBanasandra]

@iwasakims could you please review this PR?

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 28s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	shadedclient	20m 53s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	whitespace	0m 0s		The patch has no whitespace issues.
+1 💚	shadedclient	13m 3s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 34s		The patch does not generate ASF License warnings.
		36m 45s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2664/1/artifact/out/Dockerfile
GITHUB PR	#2664
Optional Tests	dupname asflicense
uname	Linux 7be7e3994954 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 6fafdd7
Max. process+thread count	678 (vs. ulimit of 5500)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2664/1/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org

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[smengcl]

Thanks @GauthamBanasandra for the patch. Glad to see some doc improvements. One change requested inline.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 4s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+1 💚	shadedclient	20m 47s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	whitespace	0m 0s		The patch has no whitespace issues.
+1 💚	shadedclient	12m 49s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 33s		The patch does not generate ASF License warnings.
		36m 59s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2664/2/artifact/out/Dockerfile
GITHUB PR	#2664
Optional Tests	dupname asflicense
uname	Linux 4a36d76055ab 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / b541346
Max. process+thread count	746 (vs. ulimit of 5500)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2664/2/console
versions	git=2.25.1 maven=3.6.3
Powered by	Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org

This message was automatically generated.

[iwasakims]

+1. Thanks, @GauthamBanasandra and @smengcl.