test: Skip some new Machines tests

They didn't run before, and still need some adjustment for the gating
environment.

tests/run-test.sh

@@ -50,6 +50,15 @@ if [ -n "$test_optional" ]; then
     # triggers SELinux violation
     EXCLUDES="$EXCLUDES TestMachines.testAddDisk"
 
+    # not investigated yet
+    EXCLUDES="$EXCLUDES
+        TestMachines.testCreateBasicValidation
+        TestMachines.testCreateImportDisk
+        TestMachines.testCreatePXE
+        TestMachines.testCreateThenInstall
+        TestMachines.testCreateUrlSource
+        TestMachines.testInlineConsoleWithUrlRoot"
+
     # TestUpdates: we can't run rebooting tests
     TESTS="$TESTS
          TestAutoUpdates