SA1135 A using directive is not qualified

eng/Common.globalconfig

@@ -846,7 +846,7 @@ dotnet_diagnostic.SA1133.severity = suggestion
 dotnet_diagnostic.SA1134.severity = suggestion
 
 # Using directive should be qualified
-dotnet_diagnostic.SA1135.severity = suggestion
+dotnet_diagnostic.SA1135.severity = warning
 
 # Enum values should be on separate lines
 dotnet_diagnostic.SA1136.severity = suggestion

src/Build/BackEnd/BuildManager/BuildParameters.cs

@@ -22,7 +22,7 @@
 
 namespace Microsoft.Build.Execution
 {
-    using Utilities = Internal.Utilities;
+    using Utilities = Microsoft.Build.Internal.Utilities;
 
     /// <summary>
     /// This class represents all of the settings which must be specified to start a build.

src/Build/BackEnd/Components/RequestBuilder/Lookup.cs

@@ -16,8 +16,8 @@
 
 namespace Microsoft.Build.BackEnd
 {
-    using ItemsMetadataUpdateDictionary = Dictionary<ProjectItemInstance, Lookup.MetadataModifications>;
-    using ItemTypeToItemsMetadataUpdateDictionary = Dictionary<string, Dictionary<ProjectItemInstance, Lookup.MetadataModifications>>;
+    using ItemsMetadataUpdateDictionary = System.Collections.Generic.Dictionary<Microsoft.Build.Execution.ProjectItemInstance, Microsoft.Build.BackEnd.Lookup.MetadataModifications>;
+    using ItemTypeToItemsMetadataUpdateDictionary = System.Collections.Generic.Dictionary<string, System.Collections.Generic.Dictionary<Microsoft.Build.Execution.ProjectItemInstance, Microsoft.Build.BackEnd.Lookup.MetadataModifications>>;
 
     /// <summary>
     /// Contains a list of item and property collections, optimized to allow

src/Build/BackEnd/Components/RequestBuilder/TargetUpToDateChecker.cs

@@ -28,8 +28,8 @@ namespace Microsoft.Build.BackEnd
     // For instance, if items were generated from an expression @(Foo->'%(Filename).obj'), then
     // the inner dictionary would have a key of "@(Foo->'%(Filename).obj')", in which would be 
     // contained a list of the items which were created/transformed using that pattern.    
-    using ItemVectorPartitionCollection = Dictionary<string, Dictionary<string, IList<ProjectItemInstance>>>;
-    using ItemVectorPartition = Dictionary<string, IList<ProjectItemInstance>>;
+    using ItemVectorPartitionCollection = System.Collections.Generic.Dictionary<string, System.Collections.Generic.Dictionary<string, System.Collections.Generic.IList<Microsoft.Build.Execution.ProjectItemInstance>>>;
+    using ItemVectorPartition = System.Collections.Generic.Dictionary<string, System.Collections.Generic.IList<Microsoft.Build.Execution.ProjectItemInstance>>;
 
     /// <summary>
     /// Enumeration of the results of target dependency analysis.

src/Build/BackEnd/Node/INode.cs

@@ -7,7 +7,7 @@
 
 namespace Microsoft.Build.BackEnd
 {
-    using NodeEngineShutdownReason = Execution.NodeEngineShutdownReason;
+    using NodeEngineShutdownReason = Microsoft.Build.Execution.NodeEngineShutdownReason;
 
     #region Delegates
     /// <summary>

src/Build/Definition/Project.cs

@@ -38,7 +38,7 @@
 
 namespace Microsoft.Build.Evaluation
 {
-    using Utilities = Internal.Utilities;
+    using Utilities = Microsoft.Build.Internal.Utilities;
 
     /// <summary>
     /// Represents an evaluated project with design time semantics.

src/Build/Definition/ProjectCollection.cs

@@ -31,7 +31,7 @@
 
 namespace Microsoft.Build.Evaluation
 {
-    using Utilities = Internal.Utilities;
+    using Utilities = Microsoft.Build.Internal.Utilities;
 
     /// <summary>
     /// Flags for controlling the toolset initialization.