There are some areas in ucb outside the issue scope that should later
be addressed, among them:

- in ucb/webdav make flag m_bTransient working right, currently lock
option for WebDAV server not supporting it is suboptimal: there are
not needed lock requests;

- change the method the modified file is checked against the old
one, using DAV:etag instead of the DateTime;

- some http status code returned by the server don't seem to be
managed;

- during WebDAV operation some redundant request of properties is
carried out.
Probably some clean up to remove these not needed transactions
is to be done.
Accessing only those really supported by the referenced href would
be better.

Changes done to the code in ucb, in no particular order

- remove current WebDAV lock management

- have the lock/unlock working correctly when the webdav resource
is first created: in the case of creation is the first lock on
the non existent resource that actually creates it

- fix a problem while fetching WebDAV properties.
If a single WebDAV non-cached property was requested, it would
 not be fetched from the server without this fix.

- change the lock owner name.
This should probably be different. Something to be discussed.
This same string can be read by all the applications accessing the
lock.

Spec reference is:
RFC4918 [2007]: '14.17.  owner XML Element'
link (as of 20150713):
http://tools.ietf.org/html/rfc4918#section-14.17

- manage WebDAV locked file exception directly while locking.
The ucb::InteractiveLockingLockedException is thrown directly
when detected by the lock command, to avoid the user interaction
activated by the cancelCommandExecution method.

- terminate gracefully if WebDAV lock/unlock is not supported

Change-Id: I4c5cd652ac7b2c32fb1c3307c34fc31d1a0305c2
Reviewed-on: https://gerrit.libreoffice.org/17080Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>