Disable deployment with app setting SCM_DISABLE_DEPLOY_ON_PUSH
Consuming x-ms-via-extensions-route header, fixes #1345
Fix WebJobs error message when calculate hash fails
Fix webjobs url to point to recent api url
Deprecated settings api should be traced when used.
Fixes #1338
Changed deprecated api hashset to be concurrent/thread safe.
Fixes #1349
Do not cache url prefix.
Fixes #1342
Retake status file lock if an error caused it to be lost (for WebJobs).
Fixes #1340