Fix bug #789 to add up to 12 Digit for a IPInterface

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@2893 a333f486-631f-4898-b8df-5754b55c2be0

datamodels/2.x/itop-config-mgmt/datamodel.itop-config-mgmt.xml

@@ -6684,7 +6684,7 @@
           <sql>speed</sql>
           <default_value/>
           <is_null_allowed>true</is_null_allowed>
-          <digits>6</digits>
+          <digits>12</digits>
           <decimals>2</decimals>
         </field>
       </fields>