Hemanth Nakkina 6a0d9ac42c Add mandatory flag to relation handlers
Following changes are done in this patch:
* Add mandatory flag to relations handler classes default
to False.
* Add mandatory_relations to charm base classes to list
all the mandatory relations.
* update relation_handlers_ready based on mandatory_relations

Change-Id: Ibc846461cf92a0a6501a15d03907c93ecdf90063
2022-09-22 13:27:08 +05:30
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