HBASE-24879 Fix the shellcheck download url

[infraio]

No description provided.

[busbey]

Please update the commit message to include the shellcheck jira.

e.g.

HBASE-24879 Fix the shellcheck download url (#2257)

update where we pull binaries from per koalaman/shellcheck#1871

Signed-off-by: Sean Busbey <busbey@apache.org>

[Apache-HBase]

(!) A patch to the testing environment has been detected.
Re-executing against the patched versions to perform further tests.
The console is at https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2257/1/console in case of problems.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	2m 54s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+0 🆗	hadolint	0m 0s	hadolint was not available.
+0 🆗	shelldocs	0m 0s	Shelldocs was not available.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ branch-2.2 Compile Tests _
+0 🆗	mvndep	0m 17s	Maven dependency ordering for branch
		_ Patch Compile Tests _
+0 🆗	mvndep	0m 8s	Maven dependency ordering for patch
+1 💚	shellcheck	0m 0s	There were no new shellcheck issues.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+0 🆗	asflicense	0m 0s	ASF License check generated no output?
		4m 27s

Subsystem	Report/Notes
Docker	Client=19.03.12 Server=19.03.12 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2257/1/artifact/out/Dockerfile
GITHUB PR	#2257
Optional Tests	dupname asflicense hadolint shellcheck shelldocs
uname	Linux b678f0ad0811 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-2257/out/precommit/personality/provided.sh
git revision	branch-2.2 / 882d2ae
Max. process+thread count	46 (vs. ulimit of 10000)
modules	C: U:
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2257/1/console
versions	git=2.11.0 maven=2018-06-17T18:33:14Z) shellcheck=0.7.1
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