testcase: share links

[jnfrmarks]

share links

[jnfrmarks]

from owncloud/core#13198

Create two users "user1" and "user2"
As "user1" create a folder "test"
Share "test" with "user2" but remove the "update" permission
Login as "user2"
Share "test" with link
Click "Allow editing"

[jnfrmarks]

From owncloud/core#13200

Create two users "user1" and "user2"
"user1" shares a folder "test" with "user2" with all permissions
"user2" reshares "test" with link and allows editing
"user1" changes the permissions of the share: remove the "update" permission
Open the link share
Try uploading files

[SergioBertolinSG]

Before creating this tests this issue has to be done.
owncloud/pyocclient#71