REGTESTS: ssl: mark set_ssl_cert_bundle.vtc as broken

set_ssl_cert_bundle.vtc requires at least OpenSSL 1.1.0 and we don't
have any way to check this when launching the reg-tests suite.

Mark the reg-test as broken since it will fails on old versions of
openSSL and libreSSL.
diff --git a/reg-tests/ssl/set_ssl_cert_bundle.vtc b/reg-tests/ssl/set_ssl_cert_bundle.vtc
index 8dfc91a..bbc34a4 100644
--- a/reg-tests/ssl/set_ssl_cert_bundle.vtc
+++ b/reg-tests/ssl/set_ssl_cert_bundle.vtc
@@ -1,4 +1,4 @@
-#REGTEST_TYPE=devel
+#REGTEST_TYPE=broken
 
 # This reg-test uses the "set ssl cert" command to update a multi-certificate
 # bundle over the CLI.
@@ -12,6 +12,7 @@
 #
 # If this test does not work anymore:
 # - Check that you have socat
+# - Check that you have at least OpenSSL 1.1.0
 
 varnishtest "Test the 'set ssl cert' feature of the CLI with bundles"
 #REQUIRE_VERSION=2.3