manager: launch TENSORBOARD_BINARY if available
#2386
Merged
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Summary:
This enables specifying the TensorBoard binary with an environment
variable. Callers previously needed to set up a
PATHwith a custombinary; this is simpler and less intrusive.
(Googlers, see comments on http://cl/236333099 for context.)
Test Plan:
The newly added test fails before this change and passes after it.
wchargin-branch: tensorboard-binary