HADOOP-17090. Increase precommit job timeout from 5 hours to 20 hours.

[aajisaka]

JIRA: https://issues.apache.org/jira/browse/HADOOP-17090

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 18s	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.
		_ trunk Compile Tests _
+1 💚	shadedclient	14m 2s	branch has no errors when building and testing our client artifacts.
		_ Patch Compile Tests _
+1 💚	shellcheck	0m 0s	There were no new shellcheck issues.
+1 💚	shelldocs	0m 16s	There were no new shelldocs issues.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedclient	13m 48s	patch has no errors when building and testing our client artifacts.
		_ Other Tests _
+1 💚	asflicense	0m 36s	The patch does not generate ASF License warnings.
		31m 40s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-2111/1/artifact/out/Dockerfile
GITHUB PR	#2111
Optional Tests	dupname asflicense shellcheck shelldocs
uname	Linux e9363c8be5a8 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / cd188ea
Max. process+thread count	414 (vs. ulimit of 5500)
modules	C: . U: .
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-2111/1/console
versions	git=2.17.1 maven=3.6.0 shellcheck=0.4.6
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[ayushtkn]

Thanx @aajisaka for taking care.
+1