ceph-osd: Log the script name, lineno and funcname

For the scripts in the ceph-osd daemonset that source common.sh (i.e.
those that run in the osd-init and ceph-osd-default containers), updates
the PS4 prompt so that the script name, line number, and function are
included in xtrace output.

Change-Id: Ieebbb82b64db4cf363ed4396289c823744d4a860

ceph-osd/templates/bin/osd/ceph-disk/_common.sh.tpl

@@ -15,6 +15,7 @@ limitations under the License.
 */}}
 
 set -ex
+export PS4='+${BASH_SOURCE:+$(basename ${BASH_SOURCE}):${LINENO}:}${FUNCNAME:+${FUNCNAME}():} '
 
 : "${CRUSH_LOCATION:=root=default host=${HOSTNAME}}"
 : "${OSD_PATH_BASE:=/var/lib/ceph/osd/${CLUSTER}}"

ceph-osd/templates/bin/osd/ceph-volume/_common.sh.tpl

@@ -15,6 +15,7 @@ limitations under the License.
 */}}
 
 set -ex
+export PS4='+${BASH_SOURCE:+$(basename ${BASH_SOURCE}):${LINENO}:}${FUNCNAME:+${FUNCNAME}():} '
 
 : "${CRUSH_LOCATION:=root=default host=${HOSTNAME}}"
 : "${OSD_PATH_BASE:=/var/lib/ceph/osd/${CLUSTER}}"