Remove redis transaction

[pradithya]

Motivation:

We are setting up sharded with twemproxy in front of it. However, twemproxy doesn't support transaction (https://github.com/twitter/twemproxy/blob/master/notes/redis.md)

Modification:

• Remove transaction in RedisCustomIO

[feast-ci-bot]

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[pradithya]

/assign @davidheryanto

[feast-ci-bot]

@pradithya: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
test-core-and-ingestion	74bff10	link	/test test-core-and-ingestion
test-serving	74bff10	link	/test test-serving
test-java-sdk	74bff10	link	/test test-java-sdk
test-golang-sdk	74bff10	link	/test test-golang-sdk
test-python-sdk	74bff10	link	/test test-python-sdk
test-end-to-end	74bff10	link	/test test-end-to-end

Full PR test history

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[zhilingc]

/lgtm

[pradithya]

I'll merge manually since the test doesn't work