[ipcamera] Fix connection checks with ONVIF cameras with no snapshots (#15119)

[ipcamera] Fix connection checks with ONVIF cameras with no snapshots (#15119)

* Added connection check via IdleStateHandler events for sent onvif requests.
Also checking connect errors and setting new states connectError or refusedError accordingly.
On connect, only one request is sent to have less parallel actions in case of reconnect, timeout.
Moved GetCapabilities call to GetSystemDateAndTime response handler part.
Added support to disable automatic polling at startup.

* Fixed call of sendOnvifRequest (missed to remove one call of requestBuilder).

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Signed-off-by: Thomas Burri <th@thonojato.ch>
Signed-off-by: Matthew Skinner <matt@pcmus.com>
Co-authored-by: Matthew Skinner <matt@pcmus.com>