Support building/packaging Windows client binaries.

Ug -- .exe suffix is a pain.  These are largely untested.
Log function use namespace
Merge pull request #2605 from derekwaynecarr/kubectl_log_ns

Log function use namespace
Merge pull request #2583 from jbeda/window-build

Support building/packaging Windows client binaries.
trace-bash flag for e2e.go
Convert gcutil to gcloud compute