Add SIP label to objects div

refs #7068

Add the label from the directory the SIP was created from to the
logical structMap's objects div. If there was an objects directory in
the arranged SIP already, delete it. Delete TYPE=Directory from the SIP
level div.
DIP Upload: Fix rsync parameters

Do not include arguments in the rsync command if the value is empty,
and include SIP UUID in arguments. Also, no need to separate with
newlines.