[IOTDB-1153] Make some small improvements(Small is beautiful，Small is powerful) - ASF JIRA

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In this Jira will make some small improvements, Small is beautiful，Small is powerful.

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GitHub Pull Request #3118

1.	Remove `final` if there are no subclasses by design.(Happy New Year)	Closed	sunjincheng
2.	Add more error info for `compaction submit task failed` in StorageGroupProcessor	Closed	sunjincheng
3.	Improve the quality and efficiency of code formatting	Closed	sunjincheng
4.	Fix iotdb-parent: null: MojoExecutionException due to sonar-maven-plugin	Closed	sunjincheng
5.	Using Java Style array declaration	Closed	sunjincheng
6.	Remove redundant toString() calls	Closed	sunjincheng
7.	Remove unnecessary modifier	Closed	sunjincheng
8.	Remove duplicated-throws	Closed	sunjincheng
9.	Clean up for redundant throw clause	Closed	sunjincheng
10.	Fix reset logic error for function call of resizeIfNecessary	Closed	sunjincheng
11.	AVG not work in cluster mode.	Closed	sunjincheng
12.	Last plan not work in cluster mode	Closed	Irvine
13.	Unified the naming of test class	Closed	Eric Pai
14.	1 node crash causes whole cluster cannot work.	Closed	Bo Zhang