Feature 2335 (#3313)

* F #3112: Bugs fixed

* F #2335: Implement clear and clear_all methods

src/vmm_mad/remotes/lib/vcenter_driver/memoize.rb

@@ -53,6 +53,15 @@ module Memoize
         @memoize[property] = current_item
     end
 
+    def clear(property)
+        @memoize = {} if !defined?(@memoize)
+        @memoize.clear[property] if @memoize[property]
+    end
+
+    def clear_all
+        @memoize = {}
+    end
+
     def []=(property, value)
         @memoize = {} if !defined?(@memoize)
 

src/vmm_mad/remotes/lib/vcenter_driver/virtual_machine.rb

@@ -2236,6 +2236,7 @@ class VirtualMachine < VCenterDriver::Template
     end
 
     def has_snapshots?
+        self.clear('rootSnapshot')
         self['rootSnapshot'] && !self['rootSnapshot'].empty?
     end