[datafeed] do NOT call commit in DataFeedXMLParser.process() (closes #10928592) and so, remove more useless code. Doing a commit in DataFeedXMLParser.process() is a bad idea because this method is called for every imported/updated entity, before handling deletions. So if we commit here, odds are quite high that we're violating some integrity constraint and end up with a ValidationError.

\.svn
^build$
^dist$
\.egg-info$
^.tox$
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\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
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syntax: regexp
.*/data.*/database/.*
.*/data/ldapdb/.*
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.*/data/cubes/.*/i18n/.*\.po
^doc/html/
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