Do not attempt to use localDb except on Windows

- #251

nit: add `--quiet` to Travis configuration so that log can be displayed in browser

.travis.yml

@@ -17,4 +17,4 @@ os:
   - osx
 osx_image: xcode7.1
 script:
-  - ./build.sh verify
+  - ./build.sh --quiet verify

test/Microsoft.AspNetCore.Diagnostics.FunctionalTests/DatabaseErrorPageSampleTest.cs

@@ -4,6 +4,7 @@
 using System.Net;
 using System.Net.Http;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Testing.xunit;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Diagnostics.FunctionalTests
@@ -17,7 +18,9 @@ namespace Microsoft.AspNetCore.Diagnostics.FunctionalTests
 
         public HttpClient Client { get; }
 
-        [Fact]
+        [ConditionalFact]
+        [OSSkipCondition(OperatingSystems.Linux)]
+        [OSSkipCondition(OperatingSystems.MacOSX)]
         public async Task DatabaseErrorPage_ShowsError()
         {
             // Arrange