Enable failed test logging and fix flaky UT

[dai-chen]

Issue #, if available: #909

Description of changes:

1. Fix UT: Suspect root cause is the use of HashSet instead of LinkedHashSet. Thus fix it and also split original UT into two in case any more flaky behavior.
2. Enable test logging for failed UT in ppl, sql, core, elasticsearch, protocol, legacy module: reference https://stackoverflow.com/questions/39350802/gradle-stack-trace-on-terminal

Sample output:

Here is an example of failed UT with current changes:

com.amazon.opendistroforelasticsearch.sql.sql.parser.AstBuilderTest > can_build_count_literal() FAILED
    org.opentest4j.AssertionFailedError: expected: <Project(projectList=[Alias(name=COUNT(1), delegated=COUNT(1), alias=null)], argExprList=[], child=[Aggregation(aggExprList=[Alias(name=COUNT(1), delegated=COUNT(1), alias=null)], sortExprList=[], groupExprList=[], argExprList=[], child=[Relation(tableName=test, alias=null)])])> but was: <Project(projectList=[Alias(name=1, delegated=1, alias=null)], argExprList=[], child=[Relation(tableName=test, alias=null)])>
        at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
        at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)
        at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
        at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
        at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1124)
        at com.amazon.opendistroforelasticsearch.sql.sql.parser.AstBuilderTest.can_build_count_literal(AstBuilderTest.java:201)

Previously without current PR changes:

com.amazon.opendistroforelasticsearch.sql.sql.parser.AstBuilderTest > can_build_count_literal() FAILED
    org.opentest4j.AssertionFailedError at AstBuilderTest.java:201

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #910 (ac50522) into develop (2a932d8) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             develop     #910   +/-   ##
==========================================
  Coverage      99.85%   99.85%           
  Complexity      2149     2149           
==========================================
  Files            216      216           
  Lines           4851     4851           
  Branches         323      323           
==========================================
  Hits            4844     4844           
  Misses             5        5           
  Partials           2        2           

Impacted Files	Coverage Δ	Complexity Δ
...rch/sql/sql/parser/context/QuerySpecification.java	100.00% <100.00%> (ø)	15.00 <0.00> (ø)

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[chloe-zh]

LGTM, thanks for the changes!