Signed-off-by: John Howard <jhoward@microsoft.com>
When building a Dockerfile from a Windows client on a Linux daemon, a
"security warning" is printed
on stderr. Having this warning printed on stderr makes it difficult to
distinguish a failed build from one that's succeeding, and the only way to
suppress the warning is through the -q option, which also suppresses every
output. This change prints the warning on stdout, instead of stderr, to
resolve this situation.
John Howard
9651fbd197