bmc: move away from blobs namespace

The blobs namespace is really owned by phosphor-ipmi-blobs.  Move all
phosphor-ipmi-flash objects into ipmi_flash namespace.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I51b721ad4f3cdc4cc43846c942967ed2e5f16589
diff --git a/test/file_handler_unittest.cpp b/test/file_handler_unittest.cpp
index 26a490d..ab12125 100644
--- a/test/file_handler_unittest.cpp
+++ b/test/file_handler_unittest.cpp
@@ -7,7 +7,7 @@
 
 #include <gtest/gtest.h>
 
-namespace blobs
+namespace ipmi_flash
 {
 
 static constexpr auto TESTPATH = "test.output";
@@ -55,4 +55,4 @@
     /* annoyingly the memcmp was failing... but it's the same data. */
 }
 
-} // namespace blobs
+} // namespace ipmi_flash