[tests-only] bug demonstration scenario for owncloud/ocis/issues/751

[individual-it]

this demonstrates the bug in owncloud/ocis/issues/751

Its useful to know when the bug gets fixed, see https://dev.to/jankaritech/should-you-write-acceptance-tests-for-bugs-2bfm

[phil-davis]

Also delete the scenario the same as was deleted in owncloud/ocis#752 ?

[phil-davis]

Note: the similar PR to owncloud/ocis is owncloud/ocis#752

[individual-it]

Also delete the scenario the same as was deleted in owncloud/ocis#752 ?

it never got ported here

[phil-davis]

it never got ported here

https://github.com/cs3org/reva/blob/master/tests/acceptance/features/apiOcisSpecific/apiShareManagementBasic-deleteShare.feature exists - but actually over time it got changed into a good scenario, that does effectively the same test as what is now in core https://github.com/owncloud/core/blob/master/tests/acceptance/features/apiShareManagementBasicToShares/deleteShareFromShares.feature#L32

The one here in cs3org/reva is not demonstrating any different behaviour to the oC10 API test suite. We can delete it.

Do that in this PR? Or in a separate PR?

[individual-it]

The bug mentioned in the file is not the same as talked about here, but still delete the file because it actually does not demonstrate the bug, nether the one that is mentioned here, nor the one that it claims to demonstrate