Split large file healthchecks.go => healthcheck.go,healthchecks.go

[bowei]

• Adds some pretty printing to the backendconfig hc options

/assign @rramkumar1 @spencerhance @freehan

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In response to this:

• Adds some pretty printing to the backendconfig hc options

/assign @rramkumar1 @spencerhance @freehan

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[spencerhance]

lgtm

[rramkumar1]

/lgtm

[rramkumar1]

Need to run gofmt

[rramkumar1]

/lgtm

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