doc-pot-filter.sh is prepared to drop numbers from *.csv.
Howover, the path of CSV files in POT files were changed from some version
of Sphinx (from "doc/source/data/*.csv" to "../../source/data/*.csv") and
doc-pot-filter.sh does not work expectedly.
This commit adjusts the path of CSV files in POT files.
The number of entries in the target POT file (atc-stats.pot) is printed
before and after the filter is applied. I believe this helps us debug
the similar issue in future if needed.
Change-Id: I32d760a735ab1ae491d7e5efb36fd5059da0cd11
66888cbd31