test-crypto-secret: add 'secret_keyring' object tests.

Add tests:
  test_secret_keyring_good;
  test_secret_keyring_revoked_key;
  test_secret_keyring_expired_key;
  test_secret_keyring_bad_serial_key;
  test_secret_keyring_bad_key_access_right;

Added tests require libkeyutils. The absence of this library is not
critical, because these tests will be skipped in this case.

Signed-off-by: Alexey Krasikov <alex-krasikov@yandex-team.ru>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
diff --git a/configure b/configure
index 3fbb619..07202ac 100755
--- a/configure
+++ b/configure
@@ -6330,6 +6330,27 @@
     fi
 fi
 
+##########################################
+# check for usable keyutils.h
+
+if test "$linux" = "yes" ; then
+
+    have_keyutils=no
+    cat > $TMPC << EOF
+#include <errno.h>
+#include <asm/unistd.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <keyutils.h>
+int main(void) {
+    return request_key("user", NULL, NULL, 0);
+}
+EOF
+    if compile_prog "" "-lkeyutils"; then
+        have_keyutils=yes
+    fi
+fi
+
 
 ##########################################
 # End of CC checks
@@ -7702,6 +7723,9 @@
 
 if test "$secret_keyring" = "yes" ; then
   echo "CONFIG_SECRET_KEYRING=y" >> $config_host_mak
+  if test "$have_keyutils" = "yes" ; then
+    echo "CONFIG_TEST_SECRET_KEYRING=y" >> $config_host_mak
+  fi
 fi
 
 if test "$tcg_interpreter" = "yes"; then