Add the ability to fetch remote repo without tags.

When fetching remote repo with tags the new remote tags are mixed in
with the local tags (all tags are saved under refs/tags), this affects
the UI of the Project given that we're showing up tags of a remote repo.

lib/gitlab_projects.rb

@@ -180,11 +180,15 @@ class GitlabProjects
     timeout = (ARGV.shift || 120).to_i
 
     # fetch with --force ?
-    forced = (ARGV.shift == '--force')
+    forced = ARGV.include?('--force')
+
+    # fetch with --tags or --no-tags
+    tags_option = ARGV.include?('--no-tags') ? '--no-tags' : '--tags'
 
     $logger.info "Fetching remote #{@name} for project #{@project_name}."
-    cmd = %W(git --git-dir=#{full_path} fetch #{@name} --tags)
+    cmd = %W(git --git-dir=#{full_path} fetch #{@name})
     cmd << '--force' if forced
+    cmd << tags_option
     pid = Process.spawn(*cmd)
 
     begin