LOG-1494: Added Formatter single_json_value

[vimalk78]

Description

As part of fix for issue 1494,. this PR adds a new formatter called single_json_value formatter, to be used with syslog plugin.

This formatter is similar to single_value formatter except that it formats the value of the configured key (default value message) in record to json if the value is a Ruby hash. else it formats to a string.

/cc
/assign

/cherry-pick

Links

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[vimalk78]

/hold

[jcantrill]

/approve

[vimalk78]

/retest

[vimalk78]

/retsst

[vimalk78]

/retest

[vimalk78]

/retest

[jcantrill]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jcantrill, vimalk78

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[vimalk78]

/retest

[vimalk78]

/hold cancel

[vimalk78]

/refresh

[openshift-ci]

@vimalk78: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/clo-functional	43e0b10	link	/test clo-functional

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[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.