HBASE-23028 Add 2.2.1 to download page

[infraio]

No description provided.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
💙	reexec	1m 46s	Docker mode activated.
		_ Prechecks _
💚	dupname	0m 0s	No case conflicting files found.
💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
💚	mvninstall	6m 2s	master passed
💚	mvnsite	24m 19s	master passed
		_ Patch Compile Tests _
💚	mvninstall	6m 20s	the patch passed
💚	mvnsite	24m 3s	the patch passed
💚	whitespace	0m 0s	The patch has no whitespace issues.
💚	xml	0m 2s	The patch has no ill-formed XML file.
		_ Other Tests _
💚	asflicense	0m 20s	The patch does not generate ASF License warnings.
		64m 8s

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-629/1/artifact/out/Dockerfile
GITHUB PR	#629
Optional Tests	dupname asflicense mvnsite xml
uname	Linux 9555cf9a44ce 4.15.0-54-generic #58-Ubuntu SMP Mon Jun 24 10:55:24 UTC 2019 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-slave/workspace/HBase-PreCommit-GitHub-PR_PR-629/out/precommit/personality/provided.sh
git revision	master / 1cb4f68
Max. process+thread count	86 (vs. ulimit of 10000)
modules	C: . U: .
Console output	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-629/1/console
versions	git=2.11.0 maven=2018-06-17T18:33:14Z)
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