* Update webapp to support rocketbot

* Revert pom.xml

* Set RocketBot as primary UI in doc

* Update submodule.

* Remove old UI submodule.

* Add rocketbot UI as submodule.

* update skywalking-rocketbot-ui commitId.

* Update ignore.

* Update powered-by.md

* Update README.md

User wall update.

* Add unit test for GRPCExporter and GRPCExporterProvider

* MockLongValueIndicator impl the LongValueHolder and MockIntValueIndicator impl the IntValueHolder

* formate the code

* 1. add unit test for ConsumerPoolFactory, EnvUtil;
2. fix the bug that Env.getLong invoking the Integer.parseInt;

* Add file header

* add Companies used

add Companies used

* Update powered-by.md

Change order

* fix default MetadataQuery Max size.

* revert mysql

* vertx plugin impl

* Update powered-by.md

* Update powered-by.md

* Update powered-by.md

* Update powered-by.md

* Provide elasticsearch template operation method.

* Fixed compile failure issue.

* Integration test for elastic search client.

* Just test verify command.

* CI command order change.

* Remove maven clean.

* no message

* Create Jenkinsfile to try the apache build for our CI.

Modify postgresql-8.x-plugin CreateStatementInterceptor.java statemen…

Modify postgresql-8.x-plugin CreateStatementInterceptor.java statementName from CallableStatement to Statement

* Update powered-by.md

* Update powered-by.md

* Update powered-by.md

Change order.

* New query graphql protocol added.

* Finish a new metric, log(abstract) with HTTP Access Log.

* Submit the draft codes of logs.

* Remove @IDColumn

* Fix startup issue.

* Add http_access_log to disable list.

* Finish a wrong service implementation.

* Add trace id in log query condition and result.

* Fix style

- found the unnecessary else block and remove it
- add test cover when AMQP.BasicProperties had null headers or headers Map had null value keys

issue #2450

* Fix npe

Make the Istio img address available.

* Make Jaeger receiver works in 12450 as default.

* Finish compile and codebase.

* Make codes runnable.

* Finish Jaeger query tests.

* Add document for jaeger receiver.

* Add readme.

* Fix a break link.

* Finish doc.