The feature cmd was incorrectly set to:
feature cmd "$HAPROXY_PROGRAM -cc 'feature(OPENSSL)' && 'openssl_version_atleast(1.1.1)'"
Which was incorrect since the quotes must surrendered the -cc argument.
Also the test requires openssl and does not work with libressl.
#REGTEST_TYPE=bug
varnishtest "Test for the bug #810 and #818"
-feature cmd "$HAPROXY_PROGRAM -cc 'feature(OPENSSL)' && 'openssl_version_atleast(1.1.1)'"
+feature cmd "$HAPROXY_PROGRAM -cc 'feature(OPENSSL) && ssllib_name_startswith(OpenSSL) && openssl_version_atleast(1.1.1)'"
# This test checks if the multiple certificate types works correctly with the
# SNI, and that the negative filters are correctly excluded