[generator] Output correct formatting for binding warnings (dotnet#737)

In d664e90 we refactored some output around binding warning messages
in order to better support localization.  Unfortunately this
refactoring left out a period between some type and member names:

	warning BG8700: Unknown return type 'Android.App.Admin.AppOpsManagerMode' for member
	'Android.App.AppOpsManagerUnsafeCheckOp (java.lang.String, int, java.lang.String)'. 

`Android.App.AppOpsManagerUnsafeCheckOp` should instead be
`Android.App.AppOpsManager.UnsafeCheckOp`.

Fix `CodeGeneratorContext.GetContextTypeMember()` so that `.`s are
inserted everywhere required.

tests/generator-Tests/Unit-Tests/CodeGeneratorContextTests.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Linq;
+using MonoDroid.Generation;
+using NUnit.Framework;
+
+namespace generatortests
+{
+	[TestFixture]
+	public class CodeGeneratorContextTests
+	{
+		[Test]
+		public void GetContextTypeMember ()
+		{
+			var klass = new TestClass ("Object", "java.code.MyClass");
+
+			klass.AddMethod (SupportTypeBuilder.CreateMethod (klass, "Echo", new CodeGenerationOptions (), "uint", false, false, new Parameter ("value", "uint", "uint", false)));
+			klass.AddField (new TestField ("string", "Foo"));
+
+			var context = new CodeGeneratorContext ();
+			context.ContextTypes.Push (klass);
+
+			Assert.AreEqual ("java.code.MyClass", context.GetContextTypeMember ());
+
+			context.ContextMethod = klass.Methods.Single ();
+
+			Assert.AreEqual ("java.code.MyClass.Echo (uint)", context.GetContextTypeMember ());
+
+			context.ContextMethod = null;
+			context.ContextField = klass.Fields.Single ();
+
+			Assert.AreEqual ("java.code.MyClass.Foo", context.GetContextTypeMember ());
+
+			context.ContextMethod = klass.Methods.Single ();
+			context.ContextField = null;
+			context.ContextTypes.Clear ();
+
+			Assert.AreEqual ("Echo (uint)", context.GetContextTypeMember ());
+		}
+	}
+}

tools/generator/CodeGeneratorContext.cs

@@ -19,14 +19,19 @@ public class CodeGeneratorContext
 
 		public string GetContextTypeMember ()
 		{
-			var output = ContextType?.FullName ?? string.Empty;
+			var parts = new List<string> ();
 
-			if (ContextMethod != null) {
-				output += $"{ContextMethod.Name} ({string.Join (", ", ContextMethod?.Parameters.Select (p => p.InternalType).ToArray ())})";
-				return output;
-			}
+			// Type name
+			if (!string.IsNullOrEmpty (ContextType?.FullName))
+				parts.Add (ContextType?.FullName);
 
-			return output + ContextField?.Name;
+			// Member name
+			if (ContextMethod != null)
+				parts.Add ($"{ContextMethod.Name} ({string.Join (", ", ContextMethod?.Parameters.Select (p => p.InternalType).ToArray ())})");
+			else if (ContextField != null)
+				parts.Add (ContextField.Name);
+
+			return string.Join (".", parts);
 		}
 	}
 }