Fix includes

This commit is automatically generated by enabling clang-include-fixer.

Tested: Code compiles.

Change-Id: I475d7b9d43e95bbdeeaadf11905d3b2a60aa8ef3
Signed-off-by: Ed Tanous <etanous@nvidia.com>
diff --git a/test/include/ssl_key_handler_test.cpp b/test/include/ssl_key_handler_test.cpp
index f60252f..cbaf4f1 100644
--- a/test/include/ssl_key_handler_test.cpp
+++ b/test/include/ssl_key_handler_test.cpp
@@ -1,7 +1,8 @@
 #include "file_test_utilities.hpp"
 #include "ssl_key_handler.hpp"
 
-#include <gmock/gmock.h>
+#include <string>
+
 #include <gtest/gtest.h>
 
 namespace ensuressl