HBASE-26964 Fix java import in admin.rb

[liangxs]

The java_import for MobCompactPartitionPolicy in admin.rb is missed, which cause an error message for creating table.

hbase:006:0> create 't2', {NAME => 'f', IS_MOB => true, MOB_THRESHOLD => 1000000, MOB_COMPACT_PARTITION_POLICY => 'weekly'}
ERROR: uninitialized constant Hbase::Admin::MobCompactPartitionPolicy
Did you mean?  Hbase::Admin::MOB_COMPACT_PARTITION_POLICY
For usage try 'help "create"'
Took 0.6897 seconds
hbase:007:0> 

[Apache-HBase]

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Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4362/1/artifact/yetus-jdk8-hadoop3-check/output/Dockerfile
GITHUB PR	#4362
Optional Tests	javac javadoc unit
uname	Linux 34b638b2f644 5.4.0-90-generic #101-Ubuntu SMP Fri Oct 15 20:00:55 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 35aa57e
Default Java	AdoptOpenJDK-1.8.0_282-b08
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🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 3s	Docker mode activated.
-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+1 💚	mvninstall	2m 50s	master passed
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		_ Patch Compile Tests _
+1 💚	mvninstall	2m 39s	the patch passed
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+1 💚	unit	7m 30s	hbase-shell in the patch passed.
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Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4362/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#4362
Optional Tests	javac javadoc unit
uname	Linux eb949de066d4 5.4.0-90-generic #101-Ubuntu SMP Fri Oct 15 20:00:55 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 35aa57e
Default Java	AdoptOpenJDK-11.0.10+9
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4362/1/testReport/
Max. process+thread count	1417 (vs. ulimit of 30000)
modules	C: hbase-shell U: hbase-shell
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4362/1/console
versions	git=2.17.1 maven=3.6.3
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[pankaj72981]

LGTM

[liangxs]

@pankaj72981 Thanks very much for your review!