feat(router): image without development libraries to reduce the size.
fix(router): build cleanup.
fix(router): ubuntu-debotstrap doesn't have netstat and confd errors are redirected to /dev/null.
fix(router): use ubuntu:14.04.
fix(router): use docker capability to decompress files.
fix(router): change nginx directory to /opt/nginx.
Merge pull request #1986 from aledbf/reduce_router_image_size

feat(router): image without development libraries to reduce the size.