Allow use gh-ost on Galera / XtraDB cluster#780

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Gonlo2 wants to merge 15 commits intogithub:masterfrom

Gonlo2:add-galera-support

Commits on Jan 27, 2020

Added changes to use a cutover based on triggers
Gonlo2
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Remove triggers
Gonlo2
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Reverted
Gonlo2
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Added logic to insert events during trigger creation
Gonlo2
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Improved sanitize step
Gonlo2
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Added doc
Gonlo2
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Added correction fixes
Gonlo2
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Added doc and fixed queries
Gonlo2
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Fixed cut-over logic and changed doc

Juan Manuel Fernandez
authored and
Gonlo2
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Added logic to remove the triggers in case of error and created channel
Gonlo2
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Explained better method logic

Juan Manuel Fernandez
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Gonlo2
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Fixed wait forever if not updates take place in the table during the cut-over

Juan Manuel Fernandez
authored and
Gonlo2
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Don't use singleton connection for the swap
Gonlo2
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Runned automatic formater
Gonlo2
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Improve sanitize message
Gonlo2
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