Endpoints Runtime Release 2.7.0

This release build was produced at e716b9f.

Docker image: gcr.io/endpoints-release/endpoints-runtime-serverless:2.7.0

Changes from release 2.6.0:

• Add X-Forwarded-Authorization header (#90)
• Detect rolloutId change from Google Service Control (#83)
• Support custom JWT locations (#44)
• Add missing logEntries for report (#68)
• Support strict transport security (#77)
• Add mTLS support for upstream connection (#52)
• Add flag --disable_cloud_trace_auto_sampling (#81)
• Add flags for print options in JSON transcoder (#57)
• Add flags for unknown query parameters in JSON transcoder… (#79)
• Add flags for Admin control (#67)
• Add flags ssl_minimum_protocol and ssl_maximum_protocol for downstream (#58)
• Suppress envoy debug headers when --enable_debug=false (#82)