Fix iscsid & tgtd sections in inventory samples

* Multinode was missing the relevant sections

* AIO had a typo and incorrect group for iscsid

Co-Authored-By: Serguei Bezverkhi <sbezverk@cisco.com>
Closes-Bug: #1572050
Change-Id: I198d9fe8997a96b77ac5cbc9e354878fb6047861

ansible/inventory/all-in-one

@@ -147,8 +147,8 @@ cinder
 storage
 
 # iSCSI
-[iscsd:children]
-storage
+[iscsid:children]
+compute
 
 [tgtd:children]
 storage

ansible/inventory/multinode

@@ -158,6 +158,13 @@ cinder
 [cinder-volume:children]
 storage
 
+# iSCSI
+[iscsid:children]
+compute
+
+[tgtd:children]
+storage
+
 # Manila
 [manila-api:children]
 manila