##### SUMMARY
Move some helper functions from `vmware_host_config_manager` to `PyVmomi`.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
vmware_host_config_manager
vmware

##### ADDITIONAL INFORMATION
`vmware_host_config_manager` has some helper functions (`is_integer`, `is_boolean` and `is_truthy`) to deal with vSphere Web Services API `OptionValue`s. Today, I started to work on issue #61421 and I think these helper functions could be useful there, too. Actually, there are several Managed Object Types with an `OptionValue[]` parameter. Instead of duplicating the code, I think it would be better to move these helper functions to `PyVmomi` in `module_utils/vmware.py`.
"""Safely get a property or return None"""
    result = vm
    for attribute in attributes:
        try:
            result = getattr(result, attribute)
        except (AttributeError, IndexError):
            return None
    return result
def gather_vm_facts(content, vm):
    """ Gather facts from vim.VirtualMachine object. """
    facts = {
        'module_hw': True,
        'hw_name': vm.config.name,
        'hw_power_status': vm.summary.runtime.powerState,
        'hw_guest_full_name': vm.summary.guest.guestFullName,
        'hw_guest_id': vm.summary.guest.guestId,
        'hw_product_uuid': vm.config.uuid,
        'hw_processor_count': vm.config.hardware.numCPU,
        'hw_cores_per_socket': vm.config.hardware.numCoresPerSocket,
        'hw_memtotal_mb': vm.config.hardware.memoryMB,
        'hw_interfaces': [],