Make zkocc.py errors include the passed arguments.

Change-Id: Ib2db02010b1b08700d76827886f56b0ad0351b7f
expvar -> stats phase 2
Sandbox time package for Go
Merge branch 'master' into rest-of-expvar
Merge branch 'zkocc.py-verbose-errors'
Merge branch 'master' into resharding

Conflicts:
	test/update_stream.py