Fix bug about PR #950, Related issues: #946.

[lunescode]

Problem: engine can't get env EUREKA_PREFER_IP.
Fix: add EUREKA_PREFER_IP into ecm engine Environment.

What is the purpose of the change

Related issues: #590.

Brief change log

• Define EUREKA_PREFER_IP in Environment.scala
• set EUREKA_PREFER_IP value in ProcessEngineConnLaunch.scala

Verifying this change

This change added tests and can be verified as follows:

set EUREKA_PREFER_IP =true, then start all service.
through scripts or resful interface to call job excute. if the job success finish,it will be ok.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no)
• Anything that affects deployment: ( no )
• The MGS(Microservice Governance Services), i.e., Spring Cloud Gateway, OpenFeign, Eureka.: ( no)

Documentation

• Does this pull request introduce a new feature? no)
• If yes, how is the feature documented? (not applicable )

[wushengyeyouya]

Hi, I am sorry to inform you that Linkis-1.0.2 has been published, please resubmit this pr to Linkis-1.0.3, thank you very much!

[lunescode]

but Linkis-1.0.3 is not syn 1.0.2 now

[peacewong]

LGTM.