Revert "HADOOP-14557. Document HADOOP-8143 (Change distcp to have -pb on by default)."

[steveloughran]

This reverts commit 44350fd.

Change-Id: If48e3dd670c920ada702dc36461ff398fe9d35cc

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 13s	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 ❌	mvninstall	22m 56s	root in trunk failed.
+1 💚	mvnsite	0m 28s	trunk passed
-1 ❌	shadedclient	39m 51s	branch has errors when building and testing our client artifacts.
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 25s	the patch passed
+1 💚	mvnsite	0m 21s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
-1 ❌	shadedclient	16m 6s	patch has errors when building and testing our client artifacts.
		_ Other Tests _
+1 💚	asflicense	0m 29s	The patch does not generate ASF License warnings.
		60m 8s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-2022/1/artifact/out/Dockerfile
GITHUB PR	#2022
Optional Tests	dupname asflicense mvnsite
uname	Linux a484d0011409 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 7836bc4
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-2022/1/artifact/out/branch-mvninstall-root.txt
Max. process+thread count	310 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-distcp U: hadoop-tools/hadoop-distcp
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-2022/1/console
versions	git=2.17.1 maven=3.6.0
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