KYLIN-4433 use cube config when uhc step enabled

[ChangjiGuo]

issue: https://issues.apache.org/jira/browse/KYLIN-4433
If the system level configuration is used, it will cause the dictionary to be built repeatedly, so I think the configuration of the cube should be used here.
Thanks!

[coveralls]

Pull Request Test Coverage Report for Build 5785

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.003%) to 27.523%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
engine-mr/src/main/java/org/apache/kylin/engine/mr/steps/CreateDictionaryJob.java	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
core-dictionary/src/main/java/org/apache/kylin/dict/lookup/cache/RocksDBLookupTable.java	1	81.08%

Totals
Change from base Build 5776:	0.003%
Covered Lines:	24306
Relevant Lines:	88310

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💛 - Coveralls

[shaofengshi]

+1

[shaofengshi]

Thank you Changji! Next time if you can add the JIRA id in git commit message, that would be great! like "KYLIN-4433 use cube config when uhc step enabled"

[ChangjiGuo]

@shaofengshi ok, next time i will pay attention. I am very glad to contribute to the community!