Merge branch 'import-in-progress-fix' into 'master'

Don't display "git clone --bare <URL>" if no URL is available

Make it clear that forking is different than importing. Forked repositories don't use `import_url`, so only display if is available. Introduced in !1231

Before:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/d8456334a2a9187b56a885f8849f229e/image.png)

After:

![image](https://gitlab.com/gitlab-org/gitlab-ce/uploads/9823e8a2baf02859c4c3f05f3a5c35bf/image.png)

See merge request !1295

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

@@ -3,7 +3,11 @@
   .center
     %h2
       %i.fa.fa-spinner.fa-spin
+      - if @project.forked?
+        Forking in progress.
+      - else
         Import in progress.
+    - unless @project.forked?
       %p.monospace git clone --bare #{hidden_pass_url(@project.import_url)}
     %p Please wait while we import the repository for you. Refresh at will.
     :javascript