Added SHA256 test certificates
With SHA-1 deprecation, we need a few certificates using algorithms in
the default support list. Most tests still use SHA-1 though.
The generation process for the new certificates is recorded in the makefile.
diff --git a/tests/data_files/test-ca-sha1.crt b/tests/data_files/test-ca-sha1.crt
new file mode 100644
index 0000000..7cb35d4
--- /dev/null
+++ b/tests/data_files/test-ca-sha1.crt
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----