firmware: implement stat command

Implement the BmcBlobStat command for the generic blob_ids, versus the
active ones.

Also, reduce the size of our transport bits to match the use-case state.

Change-Id: I9e2b28134026e8abfa18952dc80c526f0325308f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/Makefile.am b/test/Makefile.am
index d3a971d..9afb25a 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -10,10 +10,14 @@
 
 # Run all 'check' test programs
 check_PROGRAMS = \
-	firmware_handler
+	firmware_handler \
+	firmware_stat
 
 TESTS = $(check_PROGRAMS)
 
 firmware_handler_SOURCES = firmware_handler_unittest.cpp
 firmware_handler_LDADD = $(top_builddir)/firmware_handler.o
 
+firmware_stat_SOURCES = firmware_stat_unittest.cpp
+firmware_stat_LDADD = $(top_builddir)/firmware_handler.o
+