docker fixes

* expose ports 19000 and 20000
* Fix default blueflood config
* Run /src/start.sh in a blocking manner
Merge pull request #227 from rphillips/fixes/docker

docker fixes
Use fixed size pool for HTTP ingestion connection handling
Merge pull request #232 from lakshmi-kannan/bf_http_input_server_fixed_pool

Use fixed size pool for HTTP ingestion connection handling