This would fix long standing failures running tests on
my development machine, which set `Gitlab.config.gitlab.host`
to another host because it's not my local computer. Now I
finally cannot withstand it and decided to fix them once and
for all.
DRY code + fix rubocop
Add more test cases
Append to changelog
DRY changes list
find_url service for merge_requests
use GET for getting merge request links
remove files
rename to get_url_service
reduce loop
add test case for cross project
refactor tiny thing
update changelog
