Force WCOW pause process to stay alive
Force WCOW pause process to stay alive

For WCOW because there is no pause image we forcibly change the user
command to be a long running command. This behavior matches how ACI
builds their Windows pause images.

Signed-off-by: Justin Terry (VM) <f0c38945ef01caad6a7c3d4b90a29703264b34a4@microsoft.com>

Microsoft/hcsshim,madhanrm/hcsshim