'Retrieve current bundling tasks. If no bundle id is specified, all
tasks are retrieved.
:type bundle_ids: list
:param bundle_ids: A list of strings containing identifiers for
previously created bundling tasks.
:type filters: dict
:param filters: Optional filters that can be used to limit
the results returned.  Filters are provided
in the form of a dictionary consisting of
filter names as the key and filter values
as the value.  The set of allowable filter
names/values is dependent on the request
being performed.  Check the EC2 API guide
for details.
:type dry_run: bool
:param dry_run: Set to True if the operation should not actually run.'

def get_all_bundle_tasks(self, bundle_ids=None, filters=None, dry_run=False):

    params = {}
    if bundle_ids:
        self.build_list_params(params, bundle_ids, 'BundleId')
    if filters:
        self.build_filter_params(params, filters)
    if dry_run:
        params['DryRun'] = 'true'
    return self.get_list('DescribeBundleTasks', params, [('item', BundleInstanceTask)], verb='POST')
