HDFS-14729. Upgrade Bootstrap and jQuery versions used in HDFS UIs

[vivekratnavel]

This patch updates the Bootstrap and jQuery versions used by different HDFS UIs like Namenode web UI, Datanode web UI etc.

Bootstrap 3.3.7 -> 3.4.1
jQuery 3.3.1 -> 3.4.1

Testing done:
I tested the patch locally by bringing up HDFS in a pseudo distributed mode and manually browsing through UI components in localhost and made sure that there are no compatibility issues or errors thrown in the browser console. And I did not see any major change in the UI presentation as well.

[vivekratnavel]

@jnp @anuengineer @sunilgovind @vinoduec Please review when you find time

[sunilgovind]

+1

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	49	Docker mode activated.
		_ Prechecks _
+1	dupname	1	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 _
0	mvndep	68	Maven dependency ordering for branch
+1	mvninstall	1132	trunk passed
+1	compile	1099	trunk passed
+1	mvnsite	900	trunk passed
+1	shadedclient	2850	branch has no errors when building and testing our client artifacts.
+1	javadoc	362	trunk passed
		_ Patch Compile Tests _
0	mvndep	24	Maven dependency ordering for patch
+1	mvninstall	1197	the patch passed
+1	jshint	350	There were no new jshint issues.
+1	compile	1022	the patch passed
+1	javac	1022	the patch passed
+1	mvnsite	891	the patch passed
-1	whitespace	0	The patch 2 line(s) with tabs.
+1	xml	1	The patch has no ill-formed XML file.
+1	shadedclient	580	patch has no errors when building and testing our client artifacts.
+1	javadoc	357	the patch passed
		_ Other Tests _
-1	unit	8318	root in the patch failed.
+1	asflicense	45	The patch does not generate ASF License warnings.
		17207

Reason	Tests
Failed junit tests	hadoop.hdfs.server.namenode.TestFsck
	hadoop.hdfs.server.namenode.TestNameNodeMetadataConsistency
	hadoop.hdfs.server.blockmanagement.TestBlockTokenWithDFSStriped

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1297/4/artifact/out/Dockerfile
GITHUB PR	#1297
Optional Tests	dupname asflicense shadedclient compile javac javadoc mvninstall mvnsite unit xml jshint
uname	Linux c0145d2e8890 4.4.0-139-generic #165-Ubuntu SMP Wed Oct 24 10:58:50 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 6244502
Default Java	1.8.0_222
whitespace	https://builds.apache.org/job/hadoop-multibranch/job/PR-1297/4/artifact/out/whitespace-tabs.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1297/4/artifact/out/patch-unit-root.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1297/4/testReport/
Max. process+thread count	4334 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs hadoop-hdfs-project/hadoop-hdfs-rbf . U: .
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1297/4/console
versions	git=2.7.4 maven=3.3.9 jshint=2.10.2
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