Add timestamps to tool output if --timestamp flag is set (#5297)
Add timestamps to tool output if --timestamp flag is set (#5297)


* If the --timestamp flag is set, print all build and
run statements with a timestamp.
GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold