Delete ProjectImportData record only if Project is not a mirror.

This fix ensure we always use the full import URL when syncing the
mirror.

app/models/project.rb

@@ -405,7 +405,7 @@ class Project < ActiveRecord::Base
     ProjectCacheWorker.perform_async(self.id)
-    self.import_data.destroy if self.import_data
+    self.import_data.destroy if !mirror? && import_data
   end
   def import_url=(value)

spec/models/project_spec.rb

@@ -812,4 +812,27 @@ describe Project, models: true do
       expect(project.protected_branch?('foo')).to eq(false)
     end
   end
+
+  describe 'handling import URL' do
+    context 'when project is a mirror' do
+      it 'returns the full URL' do
+        project = create(:project, :mirror, import_url: 'http://user:pass@test.com')
+
+        project.import_finish
+
+        expect(project.reload.import_url).to eq('http://user:pass@test.com')
+      end
+    end
+
+    context 'when project is not a mirror' do
+      it 'returns the sanitized URL' do
+        project = create(:project, import_status: 'started', import_url: 'http://user:pass@test.com')
+
+        project.import_finish
+
+        expect(project.reload.import_url).to eq('http://test.com')
+      end
+    end
+  end
+
 end