Start obmc-console-server with its configuration file

obmc-console-server runs on defaults unless given a '--config' option.
The console configuration file was already included in the recipe source
and installed to the image, but not specified in the invocation.

Fixes openbmc/openbmc#937.

Signed-off-by: Xo Wang <xow@google.com>
Change-Id: Ib2eee6d02a5bb407ae525d67ae0a8d3ff2cde7d9