scsi-target-utils is not used in RHEL7+

scsi-target-utils has been replaced by targetcli. cinder no longer
uses scsi-target-utils, so this appears to be just legacy code.

Change-Id: Idc6623f5a5b6625367c8b7c4fade5b119f573e1a

elements/overcloud-cinder-volume/install.d/package-installs-overcloud-cinder-volume

@@ -1,4 +1,3 @@
 cinder_package
 ntp_package
 targetcli_package
-tgt_package

elements/overcloud-cinder-volume/pkg-map

@@ -2,7 +2,6 @@
   "default": {
     "cinder_package": "openstack-cinder",
     "ntp_package": "ntp",
-    "targetcli_package": "targetcli",
-    "tgt_package": "scsi-target-utils"
+    "targetcli_package": "targetcli"
   }
 }

elements/overcloud-controller/install.d/package-installs-overcloud-controller

@@ -108,6 +108,5 @@ swift_plugin_swift3_package
 swift_proxy_package
 targetcli_package
 tftp_server_package
-tgt_package
 xinetd_package
 zaqar_package

elements/overcloud-controller/pkg-map

@@ -112,7 +112,6 @@
     "targetcli_package": "targetcli",
     "tacker_package": "openstack-tacker",
     "tftp_server_package": "tftp-server",
-    "tgt_package": "scsi-target-utils",
     "xinetd_package": "xinetd",
     "zaqar_package": "openstack-zaqar"
   }