Increase grit timeout for graph log.
Increase grit timeout for graph log.

It prevent slower machines from raising exception
when it takes more time to fetch git log -8000 --shortstat

argustelecom/gitlab_git,gitlabhq/gitlab_git,ontohub/gitlab_git,argustelecom/gitlab_git,yehaha9876/gitlab_git,flycutter/gitlab_git,1ed/gitlab_git,Datacom/gitlab_git,sonalkr132/gitlab_git,ontohub/gitlab_git,flycutter/gitlab_git,yukron/gitlab_git,sadgb/gitlab_git,jvanbaarsen/gitlab_git,oliverguenther/gitlab_git,gitlabhq/gitlab_git