LU-2508 build: make ldev.conf not overwritten after upgrade

Include %config(noreplace) in the spec file so we don't lose
changes after upgrade for ldev.conf

Signed-off-by: Minh Diep <minh.diep@intel.com>
Change-Id: I9e3f892c494a6f8e3f0da27691cb5f8ac7dfe31e
Reviewed-on: http://review.whamcloud.com/4890
Tested-by: Hudson
Reviewed-by: Prakash Surya <surya1@llnl.gov>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>