CA-272163: add new exception for redirection
CA-272163: add new exception for redirection

document snapshot behaviour with redirect

It is best if the SMAPIv3 plugin will raise the redirect to avoid any confusion
with redirecting SMAPIv1 plugins.

Signed-off-by: Edwin Török <c8d178016cbaf8a6ef23c2cbc9db96123c48b7dc@citrix.com>

xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch