too many open files

[individual-it]

after doing a lot of operation in ocis (in my case running UI tests) I get
http: Accept error: accept tcp [::]:9200: accept4: too many open files; retrying in 1s

running the tests keeps on increasing the open files
check with lsof 2>/dev/null | grep ocis | wc -l

maybe the issue is creating and deleting users with skeleton folders, as there is no skeleton function in ocis, the test simply copy all files and folders from the skeleton folder into the users folder on user deletion and when deleting the user all its files also get deleted

[individual-it]

closing in favour or #268