Regenerate test files

Previous commits have added or modified build instructions for
server1*, server2*, server5*, test-ca*, cli-rsa* in the Makefile
tests/data_files/Makefile, or the apps they invoke have been changed.

This commit regenerates those files to make sure they are in match with
the build instructions.
diff --git a/tests/data_files/server2-sha256.crt b/tests/data_files/server2-sha256.crt
index 006d9db..f8a5b8b 100644
--- a/tests/data_files/server2-sha256.crt
+++ b/tests/data_files/server2-sha256.crt
@@ -1,21 +1,20 @@
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