The current defaults for the orderer have it:

1. Use the "ram" ledger
2. Set the "file" ledger's location to /tmp which means it won't persist
across restarts.

Both of these choices are unacceptable for a production environment.
This changesets sets the "file" ledger as the default and its location
to a path outside the /tmp dir, and inline with the peer's ledger.

Change-Id: I59413ceb45d0676d00fd2204e0bda9a659600dec
Signed-off-by: Kostas Christidis <kostas@christidis.io>