Adding support for the RekeyKeyPair operation

This change adds support for the ReKeyKeyPair operation, adding in
required KMIP objects and updating the KMIP client. Minor changes to the
server are included in preparation for future changes. The unit test
suite has been updated accordingly.

kmip/core/primitives.py

@@ -175,6 +175,9 @@ class Integer(Base):
         super(Integer, self).__init__(tag, type=Types.INTEGER)
 
         self.value = value
+        if self.value is None:
+            self.value = 0
+
         self.length = self.LENGTH
         self.padding_length = self.LENGTH
 
@@ -223,6 +226,15 @@ class Integer(Base):
     def __repr__(self):
         return '<Integer, %d>' % (self.value)
 
+    def __eq__(self, other):
+        if isinstance(other, Integer):
+            return self.value == other.value
+        else:
+            return NotImplemented
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
 
 class LongInteger(Base):
     LENGTH = 8