Change URLs of gitlab-rails public mirrors to match new locations

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

.custom_sources.yml

 gitlab-rails:
   remote: "git@dev.gitlab.org:gitlab/gitlabhq.git"
-  alternative: "https://gitlab.com/gitlab-org/gitlab-ce.git"
+  alternative: "https://gitlab.com/gitlab-org/gitlab-foss.git"
 gitlab-rails-ee:
   remote: "git@dev.gitlab.org:gitlab/gitlab-ee.git"
-  alternative: "https://gitlab.com/gitlab-org/gitlab-ee.git"
+  alternative: "https://gitlab.com/gitlab-org/gitlab.git"
 gitlab-shell:
   remote: "git@dev.gitlab.org:gitlab/gitlab-shell.git"
   alternative: "https://gitlab.com/gitlab-org/gitlab-shell.git"

spec/gitlab/version_spec.rb

@@ -39,7 +39,7 @@ describe Gitlab::Version do
       it 'returns "alternative" link from custom_sources yml' do
         allow(ENV).to receive(:[]).and_call_original
         allow(ENV).to receive(:[]).with("ALTERNATIVE_SOURCES").and_return("true")
-        expect(subject.remote).to eq('https://gitlab.com/gitlab-org/gitlab-ee.git')
+        expect(subject.remote).to eq('https://gitlab.com/gitlab-org/gitlab.git')
       end
     end
   end