A bit more test refactoring, and remove DSA.

Change-Id: I70a82f8f004feba6bb946144975afec40aec3791
diff --git a/google_keymaster.cpp b/google_keymaster.cpp
index f34d1ea..af0ece3 100644
--- a/google_keymaster.cpp
+++ b/google_keymaster.cpp
@@ -62,7 +62,7 @@
 // information.
 
 keymaster_algorithm_t supported_algorithms[] = {
-    KM_ALGORITHM_RSA, KM_ALGORITHM_DSA, KM_ALGORITHM_ECDSA, KM_ALGORITHM_AES,
+    KM_ALGORITHM_RSA, KM_ALGORITHM_ECDSA, KM_ALGORITHM_AES,
 };
 
 template <typename T>