Allow overlay to reinstate a port.

[web-sst]

This update allows an overlay to reinstate a port with a MOVED entry. It applies the following convention to reinstate a deleted origin:

old name (blank for reinstated)|new name|date of move|reason

MOVED files from overlays are effectively appended to the MOVED file from the base repo. This is possibly incorrect for any use except simple reinstatement.

[bdrewery]

Needs a local o at the top of the function to avoid leaking $o

[bdrewery]

We can avoid calling cat with a variable. And should fixup quoting since touching this.

local movedfiles

movedfiles="${MASTERMNT}${PORTSDIR}/MOVED"
for o in ${OVERLAYS}; do
                 test -f "${MASTERMNT}${OVERLAYSDIR}/${o}/MOVED" || continue
                 movedfiles="${movedfiles} ${MASTERMNT}${OVERLAYSDIR}/${o}/MOVED"
done
awk -f ${AWKPREFIX}/parse_MOVED.awk ${movedfiles} | \
...

I doubt we would hit the command line argument limit here but if we do then this pattern would be more efficient

{
echo file1
for o; do
echo $o
done
} | xargs cat | awk -f ...

Best to avoid fork/exec if possible.

[web-sst]

Replaced by #783