HBASE-25261 Upgrade Bootstrap to 3.4.1

[symat]

HBase UI is currently using bootstrap 3.3.7. This version is vulnerable to 4 medium CVEs (CVE-2018-14040, CVE-2018-14041, CVE-2018-14042, and CVE-2019-8331). Details on all the bootstrap versions and vulnerabilities is here: https://snyk.io/vuln/npm:bootstrap

Upgrading to bootstrap 4 would be nice, but potentially more work to do. To avoid the CVEs, we should at least upgrade to the latest bootstrap 3, which is 3.4.1 currently.

Note: I upgraded only the CSS and JS files. The font files haven't changed between 3.3.7 and 3.4.1.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 7s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+0 🆗	jshint	0m 0s	jshint was not available.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
+0 🆗	mvndep	0m 22s	Maven dependency ordering for branch
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 8s	Maven dependency ordering for patch
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+1 💚	asflicense	0m 20s	The patch does not generate ASF License warnings.
		3m 18s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#2661
Optional Tests	dupname asflicense jshint
uname	Linux 2b0187a5b655 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/hbase-personality.sh
git revision	master / 4ee2270
Max. process+thread count	51 (vs. ulimit of 30000)
modules	C: hbase-server hbase-thrift U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 28s	Docker mode activated.
-0 ⚠️	yetus	0m 4s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+0 🆗	mvndep	0m 22s	Maven dependency ordering for branch
+1 💚	mvninstall	4m 14s	master passed
+1 💚	javadoc	1m 31s	master passed
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 16s	Maven dependency ordering for patch
+1 💚	mvninstall	4m 3s	the patch passed
+1 💚	javadoc	1m 27s	the patch passed
		_ Other Tests _
+1 💚	unit	142m 3s	hbase-server in the patch passed.
+1 💚	unit	4m 52s	hbase-thrift in the patch passed.
		161m 31s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#2661
Optional Tests	javac javadoc unit
uname	Linux 876ae4045344 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 4ee2270
Default Java	AdoptOpenJDK-11.0.6+10
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/testReport/
Max. process+thread count	4184 (vs. ulimit of 30000)
modules	C: hbase-server hbase-thrift U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/console
versions	git=2.17.1 maven=3.6.3
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

This message was automatically generated.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 16s	Docker mode activated.
-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+0 🆗	mvndep	0m 22s	Maven dependency ordering for branch
+1 💚	mvninstall	4m 4s	master passed
+1 💚	javadoc	1m 11s	master passed
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 14s	Maven dependency ordering for patch
+1 💚	mvninstall	3m 51s	the patch passed
+1 💚	javadoc	1m 11s	the patch passed
		_ Other Tests _
+1 💚	unit	202m 23s	hbase-server in the patch passed.
+1 💚	unit	5m 14s	hbase-thrift in the patch passed.
		221m 47s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/artifact/yetus-jdk8-hadoop3-check/output/Dockerfile
GITHUB PR	#2661
Optional Tests	javac javadoc unit
uname	Linux 48562ca341db 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/hbase-personality.sh
git revision	master / 4ee2270
Default Java	AdoptOpenJDK-1.8.0_232-b09
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/testReport/
Max. process+thread count	3606 (vs. ulimit of 30000)
modules	C: hbase-server hbase-thrift U: .
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2661/1/console
versions	git=2.17.1 maven=3.6.3
Powered by	Apache Yetus 0.12.0 https://yetus.apache.org

This message was automatically generated.

[symat]

I also tested the patch on a real cluster, the HBase master and RS web UIs seem to work just fine