header: install test mock headers

IPMI Blob handlers will need to include these mocks when building
unit-tests.  Therefore, they must be installed.

Change-Id: I4c8ed0fa1a4a8912853c024206ef5e61f87707d8
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index 2c31b57..d9c5590 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -20,7 +20,9 @@
 
 nobase_include_HEADERS = \
 	blobs-ipmid/blobs.hpp \
-	blobs-ipmid/manager.hpp
+	blobs-ipmid/manager.hpp \
+	blobs-ipmid/test/blob_mock.hpp \
+	blobs-ipmid/test/manager_mock.hpp
 
 # Always build but only installed if you add the item:
 # BLOBIPMI_PROVIDER_LIBRARY += "libexample.so"