Use the static test fixture to speed up CreateSurfaces tests.

Reduces test runtime on my radeonsi system by 20%.  Likely a lot of
the improvement here is from being able to userspace recycle the BOs
that are being allocated.

Fixes: #247
diff --git a/test/test_va_api_createsurfaces.cpp b/test/test_va_api_createsurfaces.cpp
index 32dbe1a..2b3c262 100644
--- a/test/test_va_api_createsurfaces.cpp
+++ b/test/test_va_api_createsurfaces.cpp
@@ -34,11 +34,11 @@
 // combinations that the driver does support.
 
 class VAAPISurfaceFixture
-    : public VAAPIFixture
+    : public VAAPIFixtureSharedDisplay
 {
 public:
     VAAPISurfaceFixture(const VAProfile& p, const VAEntrypoint& e)
-        : VAAPIFixture()
+        : VAAPIFixtureSharedDisplay()
         , profile(p)
         , entrypoint(e)
     { }
@@ -47,19 +47,6 @@
     const VAProfile& profile;
     const VAEntrypoint& entrypoint;
 
-    virtual void SetUp()
-    {
-        VAAPIFixture::SetUp();
-        doInitialize();
-        ASSERT_FALSE(HasFailure());
-    }
-
-    virtual void TearDown()
-    {
-        doTerminate();
-        VAAPIFixture::TearDown();
-    }
-
     void testWithSupportedConfigAttributes(
         const std::function<void (const ConfigAttributes&)>& test)
     {