WebDAV non-compliance on some operations

Testing using the perl5-http-dav test suite (see NXP-8607) there are a few failures:

Test Summary Report
t/5_proppatch.t (Wstat: 0 Tests: 14 Failed: 3) Failed tests: 5, 10, 13
t/6_dav_copy_move.t (Wstat: 0 Tests: 14 Failed: 2) Failed tests: 10, 13
t/6_dav_lock.t (Wstat: 0 Tests: 13 Failed: 2) Failed tests: 9, 11
t/6_dav_lock2.t (Wstat: 0 Tests: 11 Failed: 2) Failed tests: 9-10
Failed 4/22 test programs. 9/217 subtests failed.

Reasons for the failures and suggested (by ron) resolution:

• 5_proppatch.t - Nuxeo does not support WebDAV proppatch operations (New Feature)
• 6_dav_copy_move.t (10) - Nuxeo does not support depth parameter on copy operation (New Feature)
• 6_dav_copy_move.t (13) - Nuxeo does not allow WebDAV lock of a deleted folder (Bug?)
• 6_dav_lock.t (9) - Nuxeo does not prevent one WebDAV client from creating a folder as a child of a folder already locked by a different client (Bug?)
• 6_dav_lock.t (11) - Nuxeo does not prevent nested locks (Bug?)
• 6_dav_lock2.t (9,10) - Nuxeo does not support shared locks and the steal operation (Won't Fix)

Subtasks should be created for issues that need to be fixed.