[Twisted-Python] PATCH: adbapi.py string escaping

[Dave Peticolas]

The 'safe' function in twisted.enterprise.adbapi escapes single
quotes, but I know at least Postgres and MySQL also accept backslash
escapes, which means embedded backslashes need to be escaped as well,
or they will be removed.

The attached patch escapes embedded backslashes. I haven't tested
it on databases other than Postgres or MySQL.

dave

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