[2/2] spark git commit: [SPARK-5388] Provide a stable application submission gateway for standalone cluster mode

[SPARK-5388] Provide a stable application submission gateway for standalone cluster mode The goal is to provide a stable, REST-based application submission gateway that is not inherently based on Akka, which is unstable across versions. This PR targets standalone cluster mode, but is

[2/2] spark git commit: [SPARK-5388] Provide a stable application submission gateway for standalone cluster mode

[SPARK-5388] Provide a stable application submission gateway for standalone cluster mode The goal is to provide a stable, REST-based application submission gateway that is not inherently based on Akka, which is unstable across versions. This PR targets standalone cluster mode, but is