Ignore columns when dumping data

Registered by ochedru

When mydumper/myloader is used in a context of database schema optimization, it may be useful to be able to ignore some source columns.
Add option --ignore-columns to ignore some columns when dumping data. Enabled only when options --complete-insert (see blueprint https://blueprints.launchpad.net/mydumper/+spec/complete-insert) and --no-schemas are specified.
The comma-separated list for this option takes column names using notation "database.table.column".

Blueprint information

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Drafter:
ochedru
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Definition:
New
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