APM Server version 7.0.0-rc1

Ensure setup cmd uses expected configuration 1934.
Ensure host.name is not added 1934, 1982.
Update Go version to 1.11.5 1840, 1950.
Ensure enabling user-agent pipeline indexes data at the same key by default 1966.
Request and Response headers are stored in a canonicalized way 1966.
Use changed processor handling from libbeat 1982.