TEZ-4417: Missing wget command in docker image

[mark-bathori]

No description provided.

[tez-yetus]

(!) 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/tez-multibranch/job/PR-210/1/console in case of problems.

[tez-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	18m 2s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+0 🆗	shelldocs	0m 0s	Shelldocs was not available.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
		_ Patch Compile Tests _
+1 💚	hadolint	0m 2s	There were no new hadolint issues.
+1 💚	shellcheck	0m 0s	There were no new shellcheck issues.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+1 💚	asflicense	1m 4s	The patch does not generate ASF License warnings.
		19m 57s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-210/1/artifact/out/Dockerfile
GITHUB PR	#210
JIRA Issue	TEZ-4417
Optional Tests	dupname asflicense hadolint shellcheck shelldocs
uname	Linux 6e1047a7af65 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	personality/tez.sh
git revision	master / 98a81b1
Max. process+thread count	51 (vs. ulimit of 5500)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-210/1/console
versions	git=2.25.1 maven=3.6.3 shellcheck=0.7.1 hadolint=1.18.0-0-g76eee5c
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