tests: force use of "NORMAL" TLS priority in test suite

When generating certificates we rely on GNUTLS' built-in default setup
for the ciphers used in the certs. We then currently run with the distro
specific TLS priority setup which can be much stronger, to the extent
that the certificates we generate are considered untrustworthy. We don't
care about the quality of the ciphers we use in the test suite, so just
force the priority to "NORMAL" which should ensure our certs are
accepted by GNUTLS.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

tests/virnettlscontexttest.c

@@ -72,7 +72,7 @@ static int testTLSContextInit(const void *opaque)
                                          data->crt,
                                          KEYFILE,
                                          NULL,
-                                         NULL,
+                                         "NORMAL",
                                          true,
                                          true);
     } else {
@@ -80,7 +80,7 @@ static int testTLSContextInit(const void *opaque)
                                          NULL,
                                          data->crt,
                                          KEYFILE,
-                                         NULL,
+                                         "NORMAL",
                                          true,
                                          true);
     }

tests/virnettlssessiontest.c

@@ -113,7 +113,7 @@ static int testTLSSessionInit(const void *opaque)
                                            data->servercrt,
                                            KEYFILE,
                                            data->wildcards,
-                                           NULL,
+                                           "NORMAL",
                                            false,
                                            true);
 
@@ -121,7 +121,7 @@ static int testTLSSessionInit(const void *opaque)
                                            NULL,
                                            data->clientcrt,
                                            KEYFILE,
-                                           NULL,
+                                           "NORMAL",
                                            false,
                                            true);