qtests: avoid printing comments before g_test_init()

The TAP protocol version line must be the first thing printed on
stdout. The migration test failed that requirement in certain
scenarios:

  # Skipping test: Userfault not available (builtdtime)
  TAP version 13
  # random seed: R02Sc120c807f11053eb90bfea845ba1e368
  1..32
  # Start of x86_64 tests
  # Start of migration tests
  ....

The TAP version is printed by g_test_init(), so we need to make
sure that any methods which print are run after that.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20230317170553.592707-1-berrange@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>

tests/qtest/migration-test.c

@@ -2462,14 +2462,18 @@ static bool kvm_dirty_ring_supported(void)
 
 int main(int argc, char **argv)
 {
-    const bool has_kvm = qtest_has_accel("kvm");
-    const bool has_uffd = ufd_version_check();
-    const char *arch = qtest_get_arch();
+    bool has_kvm;
+    bool has_uffd;
+    const char *arch;
     g_autoptr(GError) err = NULL;
     int ret;
 
     g_test_init(&argc, &argv, NULL);
 
+    has_kvm = qtest_has_accel("kvm");
+    has_uffd = ufd_version_check();
+    arch = qtest_get_arch();
+
     /*
      * On ppc64, the test only works with kvm-hv, but not with kvm-pr and TCG
      * is touchy due to race conditions on dirty bits (especially on PPC for