Logger should write to stderr when in docker

[brianbolt]

When in docker racas should write logs to stderr. Typically racas loggers write to a file called racas.log but in the case of running in docker it's hard to monitor these logs. Instead racas should write logs to stderr as stdout is reserved as the output of rapache routes. This will be controlled by a new boolean config:

server.rapache.forceAllToStdErrOnly=true
or
server.rapache.forceAllToStdErrOnly=false