LU-9791 obd: always call lprocfs_obd_setup

LU-9791 obd: always call lprocfs_obd_setup

In the case of lustre running on a single nodes the function
lprocfs_obd_setup() was not being called for lov/osc. This
was preventing sysfs from being registered. So always call
lprocfs_obd_setup(). Update lprocfs_obd_setup() to see if
obd->obd_proc_entry has already been set and return right
away.

Change-Id: Idbd99ea6a2e59eeee3991048d54c532df7d849ad
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/28747
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>