`make` is able to build project binaries, but fails with
error `hack/lib/golang.sh: line 455: go: command not found`
trying to place them if go binary is not in the PATH.
This happens because kube::golang::place_bins uses different
environment than kube::golang::build_binaries.
Setting up an one environment for both `kube::golang::place_bins`
and `kube::golang::build_binaries` should solve this issue and allow
default make target to fully work without go binary in the PATH.
The KUBE_VERBOSE environment variable sets the verbosity level to
use. Log messages can specify a verbosity by setting the V
variable. e.g.
V=2 kube::log::info foo bar
Would only print "foo bar" if $KUBE_VERBOSE >= 2.
This allows us to start building real dependencies into Makefile.
Leave old hack/* scripts in place but advise to use 'make'. There are a few
rules that call things like 'go run' or 'build/*' that I left as-is for now.