iam UT fixes:

iam UT fixes:

 - defect: iam_lfix_node_check(): wrong assignment.

 - defect: inverted comparison in iam_path_check().

 - defect: iam_lfix_can_add(): wrong array origin.

 - defect: split_index_node(): wrong setup of entry count in the new root.

 - defect: ext3_dx_add_entry(): wrong frame passed to do_split().

 - defect: split_index_node() has to move path->ip_frame when new frame is inserted.

 - defect: split_index_node() mark new root dirty.

 - defect: split_index_node() mark modified parent as dirty.

 - defect: split_index_node() wrong code incrementing tree height.

 - defect: split_index_node(): should use iam_insert_key() to insert new pointer.