Remove obsolete split-pane container and associated controller; this behavior is now handled by the mct-split-pane directive. Part of updates to tests for the mct-split-pane directive, WTD-1400
Remove obsolete split-pane container and associated controller; this behavior is now handled by the mct-split-pane directive. Part of updates to tests for the mct-split-pane directive, WTD-1400