[MESOS-6991] Change `Environment.Variable.Value` from required to optional

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.2.0
• Epic Link: Executor Authentication
• Sprint: Mesosphere Sprint 49, Mesosphere Sprint 50
• Story Points: 2
• Assignee: Greg Mann
• Reporter: Greg Mann
• Shepherd: Vinod Kone
• Created: 25/Jan/17 20:07
• Updated: 01/Feb/17 22:18
• Resolved: 01/Feb/17 22:18

Description

To prepare for future work which will enable the modular fetching of secrets, we should change the Environment.Variable.Value field from required to optional. This way, the field can be left empty and filled in by a secret fetching module.