YARN-11707. Fix UT checkstyle error in TestRMAdminCLI #6958
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In patch #6957 ,checkstyle error always exists ,Fix all the checkstyle error like:
./hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/cli/TestRMAdminCLI.java:781: testError(new String[] { "-help", "-xxxxx" },:30: '{' is followed by whitespace. [NoWhitespaceAfter]