Fix: Multipath blacklist compute root disks (#750)

* Fix: Multipath blacklist compute root disks

Adding two blacklist lines to keep multipath from
dealing with the compute root disks /dev/sda[0-9]*
and /dev/sdb[0-9]*.

* Fix: Adding additional non-multipath devices to blacklist

Author: dwith

ansible/playbooks/templates/genestack-multipath.conf

@@ -9,6 +9,10 @@ blacklist {
     devnode    "scini*"
     devnode    "^rbd[0-9]*"
     devnode    "^nbd[0-9]*"
+    devnode    "^sda[0-9]*"
+    devnode    "^sdb[0-9]*"
+    devnode    "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
+    devnode    "^(td|ha)d[a-z]"
 }
 
 blacklist_exceptions {