ctdb-scripts: filter out comments in public_addresses file

Note that order of sed expressions matters: the expression to delete
comment lines must come first as the second expression would transform

  # comment

to

  comment

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14826

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Martin Schwenke <martin@meltin.net>
(cherry picked from commit 530e8d4b9e)

ctdb/config/events/legacy/10.interface.script

@@ -25,7 +25,8 @@ fi
 get_all_interfaces ()
 {
     # Get all the interfaces listed in the public_addresses file
-    all_interfaces=$(sed -e 's/^[^\t ]*[\t ]*//' \
+    all_interfaces=$(sed -e '/^#.*/d' \
+			 -e 's/^[^\t ]*[\t ]*//' \
 			 -e 's/,/ /g' \
 			 -e 's/[\t ]*$//' "$ctdb_public_addresses")
 

ctdb/config/functions

@@ -611,6 +611,9 @@ drop_all_public_ips ()
 	# _x is intentionally ignored
 	# shellcheck disable=SC2034
 	while read _ip _x ; do
+		case "$_ip" in
+		\#*) continue ;;
+		esac
 		drop_ip "$_ip"
 	done <"${CTDB_BASE}/public_addresses"
 }