Make modprobe module check for builtins as well (#37150)

Without this modprobe always reports changed when modprobe-ing a builtin module.

With this, if a kernel module is a builtin, the modprobe module will:
- succeed (without incorrectly reporting changed) if ``state`` is ``present``;
- fail if ``state`` is ``absent``

The failure will have whatever error message modprobe returns when
attempting to remove a builtin module. For example:
``modprobe: ERROR: Module nfs is builtin.``

lib/ansible/modules/system/modprobe.py

@@ -83,14 +83,22 @@ def main():
 
     # Check if module is present
     try:
-        modules = open('/proc/modules')
         present = False
-        module_name = name.replace('-', '_') + ' '
-        for line in modules:
-            if line.startswith(module_name):
-                present = True
-                break
-        modules.close()
+        with open('/proc/modules') as modules:
+            module_name = name.replace('-', '_') + ' '
+            for line in modules:
+                if line.startswith(module_name):
+                    present = True
+                    break
+        if not present:
+            command = [module.get_bin_path('uname', True), '-r']
+            rc, uname_kernel_release, err = module.run_command(command)
+            module_file = '/' + name + '.ko'
+            with open('/lib/modules/' + uname_kernel_release + '/modules.builtin') as builtins:
+                for line in builtins:
+                    if line.endswith(module_file):
+                        present = True
+                        break
     except IOError as e:
         module.fail_json(msg=to_native(e), exception=traceback.format_exc(), **result)