Bug 5329: Add factory akka.conf

Bug 5329: Add factory akka.conf

Added a factory akka.conf file that is shipped to
configuration/factory/akka.conf. This file contains all the necessary
akka settings. Modified the FileAkkaConfigurationReader to load the
existing configuration/initial/akka.conf file with the factory file as
the fallback. In this manner akka will overlay/merge the initial file
with the factory file. I pared down the initial file to only contain the
settings that users would normally set or configure to setup a cluster,
ie hostname, port, seed-nodes, roles.

In the features.xml, the factory file is configured to always overwrite
so changes are picked up on upgrade. We still preserve the initial file.

Change-Id: I8e80161e21d0ad0e26f1efa1023c670b3a5ef6bc
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>