fix panic when timeout is nil in gitlab cloneOptions

[yudong2015]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #873

Special notes for reviewers:

Please check the following list before waiting reviewers:

• Already committed the CRD files to the Helm Chart if you created some new CRDs
• Already added the permission for the new API
• Already added the RBAC markers for the new controllers

Does this PR introduce a user-facing change??

fix panic when timeout is nil in gitlab cloneOptions

[yudong2015]

/cherrypick release-3.4
/cherrypick release-3.5

[ks-ci-bot]

@yudong2015: once the present PR merges, I will cherry-pick it on top of release-3.4 in a new PR and assign it to you.

In response to this:

/cherrypick release-3.4
/cherrypick release-3.5

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[chilianyi]

/lgtm
/approve

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chilianyi

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/client/devops/OWNERS [chilianyi]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ks-ci-bot]

@yudong2015: new pull request created: #1016

In response to this:

/cherrypick release-3.4
/cherrypick release-3.5

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ks-ci-bot]

@yudong2015: new pull request created: #1017

In response to this:

/cherrypick release-3.4
/cherrypick release-3.5

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.