HADOOP-16579 - Upgrade to Apache Curator 4.2.0 excluding ZK

[nkalmar]

An integration/smoke test with multiple components (HDFS, HBase, Spark etc) is in progress.
I will update the PR once done.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	73	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
+1	@author	0	The patch does not contain any @author tags.
-1	test4tests	0	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	1212	trunk passed
+1	compile	18	trunk passed
+1	mvnsite	19	trunk passed
+1	shadedclient	2079	branch has no errors when building and testing our client artifacts.
+1	javadoc	19	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	12	the patch passed
+1	compile	12	the patch passed
+1	javac	12	the patch passed
+1	mvnsite	14	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	xml	1	The patch has no ill-formed XML file.
+1	shadedclient	865	patch has no errors when building and testing our client artifacts.
+1	javadoc	15	the patch passed
		_ Other Tests _
+1	unit	14	hadoop-project in the patch passed.
+1	asflicense	30	The patch does not generate ASF License warnings.
		3283

Subsystem	Report/Notes
Docker	Client=19.03.2 Server=19.03.2 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1531/1/artifact/out/Dockerfile
GITHUB PR	#1531
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient xml
uname	Linux f0568069ed2e 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	personality/hadoop.sh
git revision	trunk / 7b6219a
Default Java	1.8.0_222
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1531/1/testReport/
Max. process+thread count	305 (vs. ulimit of 5500)
modules	C: hadoop-project U: hadoop-project
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1531/1/console
versions	git=2.7.4 maven=3.3.9
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