Revert "Avoid triggering reconcileTFJobs if no TFJob update (#796)"

[gaocegege]

Close #800
This reverts commit 554d750.

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This change is 

[gaocegege]

/assign @jian-he @jlewi

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[johnugeorge]

/lgtm

[coveralls]

Coverage increased (+0.2%) to 58.282% when pulling 91ef1ca on gaocegege:revert into e63ea46 on kubeflow:master.

[gaocegege]

/retest

[johnugeorge]

/retest

[gaocegege]

/approve

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[gaocegege]

/retest

[jian-he]

sorry for late response. I commented the rationale for this change. Please see if it makes sense.