Add typoed name DataPropagationLatencyGuage as deprecated

[huizhilu]

Issues

• My PR addresses the following Helix issues and references them in the PR title:
  Name DataPropagationLatencyGauge has a typo #512
  If we remove the typoed name DataPropagationLatencyGuage, current metrics graph may not see the metric and historical DataPropagationLatencyGuage data may be lost. To solve the problem, we need to add back DataPropagationLatencyGuage and set it as deprecated.

Description

• Here are some details about my PR, including screenshots of any UI changes:
  If we remove the typoed name DataPropagationLatencyGuage, current metrics graph may not see the metric and historical DataPropagationLatencyGuage data may be lost. To solve the problem, we need to add back DataPropagationLatencyGuage and set it as deprecated.

Tests

• [] The following tests are written for this issue:
  (List the names of added unit/integration tests)

• The following is the result of the "mvn test" command on the appropriate module:

Tests all pass.

[INFO] Results:
[INFO]
[ERROR] Failures:
[ERROR] TestPartitionLevelTransitionConstraint.test:160 expected: but was:
[ERROR] TestTaskPerformanceMetrics.testTaskPerformanceMetrics:118 expected: but was:
[INFO]
[ERROR] Tests run: 882, Failures: 2, Errors: 0, Skipped: 0
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 53:55 min
[INFO] Finished at: 2019-10-21T22:41:58-07:00

END TestPartitionLevelTransitionConstraint_test at Mon Oct 21 22:47:22 PDT 2019
END test at Mon Oct 21 22:47:22 PDT 2019, took: 1650ms.
Shut down zookeeper at port 2183 in thread main
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.305 s - in org.apache.helix.integration.TestPartitionLevelTransitionConstraint
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

TestTaskPerformanceMetrics#testTaskPerformanceMetrics
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 16.152 s - in org.apache.helix.monitoring.mbeans.TestTaskPerformanceMetrics
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
[INFO]

Commits

• My commits all reference appropriate Apache Helix GitHub 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":
  Subject is separated from body by a blank line
  Subject is limited to 50 characters (not including Jira issue reference)
  Subject does not end with a period
  Subject uses the imperative mood ("add", not "adding")
  Body wraps at 72 characters
  Body explains "what" and "why", not "how"
  Documentation

  In case of new functionality, my PR adds documentation in the following wiki page:
  (Link the GitHub wiki you added)

Code Quality

• My diff has been formatted using helix-style-intellij.xml

[narendly]

Please address my comments. Looks good. Thanks for adding it back!

[huizhilu]

This PR is ready to be merged, approved by @narendly

Final commit comment:
If we remove the typoed name DataPropagationLatencyGuage, current metrics graph may not see the metric and historical DataPropagationLatencyGuage data may be lost. To support backward compatibility, add back DataPropagationLatencyGuage and set it as deprecated.