[Remove Deprecation] Remove get_waiter and list_waiters from boto3_elasticsearch.py

[Ch3LL]

from salt/utils/boto3_elasticsearch.py remove functions list_waiters and get_waiter

 97 @salt.utils.decorators.is_deprecated(globals(), "Sulfur")                                                                                                                                                                                                 
 98 +-- 23 lines: def get_waiter(client, waiter=None, waiter_config=None):
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122                                                                                                                                                                                                                                                           
123 @salt.utils.decorators.is_deprecated(globals(), "Sulfur")     
124 +--  7 lines: def list_waiters():