move internal namespace under ipmiblob namespace

Avoid collisions if anyone else has this class under their own internal
namespace by properly wrapping this internal namespace under the
library's.

Change-Id: I935c017cc109f12b339f4c65258ee43a03b3a3d5
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/internal_sys_mock.hpp b/test/internal_sys_mock.hpp
index b4ba4b1..2fe0c58 100644
--- a/test/internal_sys_mock.hpp
+++ b/test/internal_sys_mock.hpp
@@ -6,6 +6,8 @@
 
 #include <gmock/gmock.h>
 
+namespace ipmiblob
+{
 namespace internal
 {
 
@@ -25,3 +27,4 @@
 };
 
 } // namespace internal
+} // namespace ipmiblob