ceph/start.sh: remove /var/tmp/ceph at start.

This is a check to make sure it was properly removed after the last
build.

Change-Id: I2e425e81b88116190034f181e8aaa0e0a17ddb77
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/401860
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Liang Yan <liang.z.yan@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>

scripts/ceph/start.sh

@@ -17,7 +17,9 @@ dev_backend=/dev/ceph
 image=/var/tmp/ceph_raw.img
 dev=/dev/loop200
 # partition osd
-
+if [ -d $base_dir ]; then
+	rm -rf $base_dir
+fi
 mkdir ${base_dir}
 cp ${script_dir}/ceph.conf $ceph_conf