Parse if a datastore is accessible from a host

Parse if a datastore is able to be accessed from a host into the
host_storage record.

https://bugzilla.redhat.com/show_bug.cgi?id=1668020

app/models/manageiq/providers/vmware/infra_manager/refresh_parser.rb

@@ -770,12 +770,15 @@ def self.host_inv_to_host_storages_hashes(inv, storage_inv, storage_uids)
           host_mount = Array.wrap(s_inv["host"]).detect { |host| host["key"] == inv["MOR"] }
           next if host_mount.nil?
 
-          read_only = host_mount.fetch_path("mountInfo", "accessMode") == "readOnly"
+          mount_info = host_mount["mountInfo"] || {}
+          read_only  = mount_info["accessMode"] == "readOnly"
+          accessible = mount_info["accessible"].present? ? mount_info["accessible"] : true
 
           result << {
-            :storage   => storage_uids[s_mor],
-            :read_only => read_only,
-            :ems_ref   => s_mor
+            :storage    => storage_uids[s_mor],
+            :read_only  => read_only,
+            :accessible => accessible,
+            :ems_ref    => s_mor
           }
         end