Remove duplicate entry of commons-io dependency in phoenix-pherf

[martin-g]

Resolves the following warning in Maven logs:

[WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.phoenix:phoenix-pherf:jar:5.2.0-SNAPSHOT
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: commons-io:commons-io:jar -> duplicate declaration of version (?) @ line 136, column 17
[WARNING] 

[stoty]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 12s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s	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.
		_ master Compile Tests _
+1 💚	mvninstall	15m 42s	master passed
+0	hbaserecompile	23m 9s	HBase recompiled.
+1 💚	compile	0m 33s	master passed
+1 💚	javadoc	0m 23s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	8m 10s	the patch passed
+0	hbaserecompile	39m 30s	HBase recompiled.
+1 💚	compile	0m 33s	the patch passed
+1 💚	javac	0m 33s	the patch passed
+1 💚	whitespace	0m 1s	The patch has no whitespace issues.
+1 💚	xml	0m 2s	The patch has no ill-formed XML file.
+1 💚	javadoc	0m 23s	the patch passed
		_ Other Tests _
-1 ❌	unit	8m 37s	phoenix-pherf in the patch failed.
+1 💚	asflicense	0m 15s	The patch does not generate ASF License warnings.
		51m 19s

Reason	Tests
Failed junit tests	phoenix.pherf.PherfMainIT

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/Phoenix/job/Phoenix-PreCommit-GitHub-PR/job/PR-1241/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#1241
Optional Tests	dupname asflicense javac javadoc unit xml compile
uname	Linux e54a9250a6dc 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev/phoenix-personality.sh
git revision	master / 3231aad
Default Java	Private Build-1.8.0_242-8u242-b08-0ubuntu3~16.04-b08
unit	https://ci-hadoop.apache.org/job/Phoenix/job/Phoenix-PreCommit-GitHub-PR/job/PR-1241/1/artifact/yetus-general-check/output/patch-unit-phoenix-pherf.txt
Test Results	https://ci-hadoop.apache.org/job/Phoenix/job/Phoenix-PreCommit-GitHub-PR/job/PR-1241/1/testReport/
Max. process+thread count	2326 (vs. ulimit of 30000)
modules	C: phoenix-pherf U: phoenix-pherf
Console output	https://ci-hadoop.apache.org/job/Phoenix/job/Phoenix-PreCommit-GitHub-PR/job/PR-1241/1/console
versions	git=2.7.4 maven=3.3.9
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[stoty]

Committed to master and 5.1