[GOBBLIN-984] Add log4j2.xml to enable log4j2 functionality

[jhsenjaliya]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• [ ] My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-984

Description

• [x] Here are some details about my PR, including screenshots (if applicable):

Tests

• [x] My PR adds the following unit tests OR does not need testing for this extremely good reason: script and log config changes

Commits

• [x] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[jhsenjaliya]

@Will-Lo , pls review. pls also take a look at this, its also related to config changes: https://github.com/apache/incubator-gobblin/pull/2788 Thanks

[codecov-io]

Codecov Report

Merging #2830 into master will increase coverage by <.01%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2830      +/-   ##
============================================
+ Coverage     45.62%   45.63%   +<.01%     
- Complexity     8971     8976       +5     
============================================
  Files          1902     1902              
  Lines         71284    71284              
  Branches       7862     7862              
============================================
+ Hits          32523    32529       +6     
+ Misses        35771    35764       -7     
- Partials       2990     2991       +1

Impacted Files	Coverage Δ	Complexity Δ
...lin/restli/throttling/ZookeeperLeaderElection.java	70% <0%> (-2.23%)	13% <0%> (ø)
.../org/apache/gobblin/cluster/GobblinTaskRunner.java	63.88% <0%> (-1.39%)	29% <0%> (-1%)
...main/java/org/apache/gobblin/util/HadoopUtils.java	30.87% <0%> (+0.67%)	25% <0%> (+1%)	:arrow_up:
...main/java/org/apache/gobblin/yarn/YarnService.java	15.68% <0%> (+0.84%)	4% <0%> (+1%)	:arrow_up:
...e/gobblin/runtime/locks/ZookeeperBasedJobLock.java	64.44% <0%> (+1.11%)	16% <0%> (+1%)	:arrow_up:
...in/java/org/apache/gobblin/cluster/HelixUtils.java	35.51% <0%> (+2.8%)	12% <0%> (+1%)	:arrow_up:
...lin/util/filesystem/FileSystemInstrumentation.java	92.85% <0%> (+7.14%)	4% <0%> (+1%)	:arrow_up:
...a/org/apache/gobblin/util/limiter/NoopLimiter.java	60% <0%> (+20%)	3% <0%> (+1%)	:arrow_up:

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[Will-Lo]

So far LGTM, going to test it out first after #2788 is good to go

[jhsenjaliya]

This needs #2685 back in to support the base log4j2 functionality.