harbor: Can't refresh token via Gitlab OIDC

If you are reporting a problem, please make sure the following information are provided:

Expected behavior and actual behavior:

When I login via gitlab with OIDC, the login state will expire very soon, yeah, 120 second. I hope it can be longer.

Steps to reproduce the problem:

1. create a gitlab application, and select the scope for openid
2. then configure the harbor to login via OIDC
3. and auth works, but after 120s, it will return 401 of /api/users/current
4. check the core.log, will find it failed to refresh the token

Versions: Please specify the versions of following systems.

• harbor version: [1.8.0]
• docker engine version: [18.06.1]
• docker-compose version: [1.22.0]

Additional context:

• Harbor config files: You can get them by packaging harbor.cfg and files in the same directory, including subdirectory.
• Log files:

 109 Jun 17 20:28:02 172.19.0.1 core[3804654]: 2019-06-17T12:28:02Z [ERROR] [/common/api/base.go:69]: GET /api/users/current failed with error: {"code":401,"message":"UnAuthorize"}
 110 Jun 17 20:28:02 172.19.0.1 core[3804654]: 2019/06/17 12:28:02 #033[1;44m[D] [server.go:2774] |   10.115.21.44|#033[43m 401 #033[0m|   2.131508ms|   match|#033[44m GET     #033[0m /api/     users/current   r:/api/users/:id#033[0m
 111 Jun 17 20:28:02 172.19.0.1 core[3804654]: 2019-06-17T12:28:02Z [INFO] [/common/utils/oidc/secret.go:110]: Failed to verify ID Token, error: oidc: token is expired (Token Expiry: 2019-      06-17 12:27:03 +0000 UTC), refreshing...
 112 Jun 17 20:28:02 172.19.0.1 core[3804654]: 2019-06-17T12:28:02Z [ERROR] [/core/filter/security.go:509]: Failed to verify secret, error: failed to verify the secret: failed to get            id_token from refresh response