Add AuthorizationSetBuilder.

Actually move it from google_keymaster_test, where it was called
ParamBuilder.  This is a generally-useful tool.

Change-Id: I07200cdf2e5628289d9e544af02efe519ca124d3
diff --git a/google_keymaster_test_utils.cpp b/google_keymaster_test_utils.cpp
index d0457ec..ce14330 100644
--- a/google_keymaster_test_utils.cpp
+++ b/google_keymaster_test_utils.cpp
@@ -96,6 +96,10 @@
     return true;
 }
 
+bool operator!=(const AuthorizationSet& a, const AuthorizationSet& b) {
+    return !(a == b);
+}
+
 std::ostream& operator<<(std::ostream& os, const AuthorizationSet& set) {
     if (set.size() == 0)
         os << "(Empty)" << std::endl;