improve getConsumer

[nikam14]

Motivation

In contextImpl.java the getConsumer() - When trying to get partitioned topic consumer it throws error consumer not found.
Instead show error message that partitioned topic not present.
Also reduces computation to search for consumer.

Modifications

Added a boolean var to check partitioned topic present or not.
when try to get consumer check whether partitioned topic present then proceed.

Verifying this change

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This change is already covered by existing tests, such as ContextImplTest.

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