feat(bulk): forward 'checkKeys' option for ordered and unordered bulk operations

* Forward checkKeys option for ordered and unordered bulks

* checkKeys: fix tests

Author: assaf-xm

lib/bulk/ordered.js

@@ -303,7 +303,9 @@ function OrderedBulkOperation(topology, collection, options) {
     bypassDocumentValidation:
       typeof options.bypassDocumentValidation === 'boolean'
         ? options.bypassDocumentValidation
-        : false
+        : false,
+    // check keys
+    checkKeys: typeof options.checkKeys === 'boolean' ? options.checkKeys : true
   };
 }
 
@@ -513,6 +515,11 @@ var executeCommands = function(self, options, callback) {
     finalOptions.bypassDocumentValidation = true;
   }
 
+  // Is the checkKeys option disabled
+  if (self.s.checkKeys === false) {
+    finalOptions.checkKeys = false;
+  }
+
   try {
     if (batch.batchType === common.INSERT) {
       self.s.topology.insert(

lib/bulk/unordered.js

@@ -312,7 +312,9 @@ var UnorderedBulkOperation = function(topology, collection, options) {
     bypassDocumentValidation:
       typeof options.bypassDocumentValidation === 'boolean'
         ? options.bypassDocumentValidation
-        : false
+        : false,
+    // check keys
+    checkKeys: typeof options.checkKeys === 'boolean' ? options.checkKeys : true
   };
 };
 
@@ -474,6 +476,11 @@ var executeBatch = function(self, batch, options, callback) {
     finalOptions.bypassDocumentValidation = true;
   }
 
+  // Is the checkKeys option disabled
+  if (self.s.checkKeys === false) {
+    finalOptions.checkKeys = false;
+  }
+
   try {
     if (batch.batchType === common.INSERT) {
       self.s.topology.insert(