mu: update unit tests

They need to use 'mu init' as well.

mu/test-mu-cmd-cfind.c

@@ -40,10 +40,13 @@ fill_contacts_cache (void)
 	GError *err;
 
 	tmpdir = test_mu_common_get_random_tmpdir();
-	cmdline = g_strdup_printf ("%s index --muhome=%s --maildir=%s"
-				   " --quiet",
-				   MU_PROGRAM,
-				   tmpdir, MU_TESTMAILDIR);
+	cmdline = g_strdup_printf (
+		"/bin/sh -c '"
+		"%s init  --muhome=%s --maildir=%s --quiet; "
+		"%s index --muhome=%s  --quiet'",
+		MU_PROGRAM,  tmpdir, MU_TESTMAILDIR,
+		MU_PROGRAM,  tmpdir);
+
 	if (g_test_verbose())
 		g_print ("%s\n", cmdline);