Merge branch 'gt-change-container-width-for-project-import' into 'master'

Change container width for project import

See merge request gitlab-org/gitlab-ce!23318

app/views/projects/imports/show.html.haml

 - page_title import_in_progress_title
+- @no_container = true
+- @content_class = "limit-container-width" unless fluid_layout
 
 .save-project-loader
   .center

changelogs/unreleased/gt-change-container-width-for-project-import.yml

+---
+title: Change container width for project import
+merge_request: 23318
+author: George Tsiolis
+type: fixed