webportal can't show legacy job log

[mzmssg]

Organization Name:
Microsoft

Short summary about the issue/question:
v0.13 rename job logs:

stdout -> user.pai.stdout
stderr -> user.pai.stderr

A job submitted before v0.13 has an old-style logname like stdout, but new webportal try to retrive new-style name, like user.pai.stdout:

OpenPAI Environment:

• OpenPAI version: v0.13

[debuggy]

status unknown

[fanyangCS]

fixed.