[Xamarin.Android.Build.Tasks] Add Debug info for Lint Task (#947)

We need to output the Lint tool Path we use and the Lint Tool
version for diagnostic purposes. So if it does fail we have
the information we need to correct the issue.

src/Xamarin.Android.Build.Tasks/Tasks/Lint.cs

@@ -186,6 +186,7 @@ namespace Xamarin.Android.Tasks
 			}
 
 			Version lintToolVersion = GetLintVersion (GenerateFullPathToTool ());
+			Log.LogDebugMessage ("  LintVersion: {0}", lintToolVersion);
 			foreach (var issue in DisabledIssuesByVersion) {
 				if (lintToolVersion >= issue.Value) {
 					if (string.IsNullOrEmpty (DisabledIssues) || !DisabledIssues.Contains (issue.Key))