ensure gnutls-utils are installed when building

This is needed for certain tests

ocserv.spec

@@ -57,6 +57,7 @@ BuildRequires:	gnutls-devel
 BuildRequires:	pam-devel
 BuildRequires:	iproute
 BuildRequires:	openconnect
+BuildRequires:  gnutls-utils
 
 %if (0%{?use_local_protobuf} == 0)
 BuildRequires:	protobuf-c-devel
@@ -203,7 +204,7 @@ mkdir -p -m 700 %{_sysconfdir}/pki/ocserv/private
 mkdir -p %{_sysconfdir}/pki/ocserv/cacerts
 
 %check
-make check %{?_smp_mflags} XFAIL_TESTS="test-sighup-key-change resumption"
+make check %{?_smp_mflags} XFAIL_TESTS=test-sighup-key-change
 
 %if %{use_systemd}
 %post