rados: add ioctx destroy method

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>

ioctx.go

@@ -84,3 +84,10 @@ func (p *IOContext) Truncate(oid string, size uint64) error {
         return RadosError(int(ret))
     }
 }
+
+// Destroy informs librados that the I/O context is no longer in use.
+// Resources associated with the context may not be freed immediately, and the
+// context should not be used again after calling this method.
+func (ioctx *IOContext) Destroy() {
+    C.rados_ioctx_destroy(ioctx.ioctx)
+}

rados_test.go

@@ -114,6 +114,7 @@ func TestGetClusterStats(t *testing.T) {
         }
     }
 
+    pool.Destroy()
     conn.Shutdown()
     t.Error("Cluster stats aren't changing")
 }
@@ -302,4 +303,6 @@ func TestReadWrite(t *testing.T) {
 
     assert.Equal(t, n_out, len(bytes_in))
     assert.Equal(t, bytes_in, bytes_out)
+
+    pool.Destroy()
 }