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Merge remote-tracking branch 'origin/master'
Simplify code

foreach on empty list does nothing, so we can skip the initial
condition.

Signed-off-by: Michal Čihař <michal@cihar.com>
Remove explicit unsetting of local variables

This was useful in global scope, but makes no sense when used inside
method as all it's variables are cleaned up anyway.

Signed-off-by: Michal Čihař <michal@cihar.com>
Remove workaround for older MySQL versions

Remove workaround originally implemented for MySQL < 5.0.2, but also
useful in 5.1.x times for listing tables within database when
permissions on one of database directories are wrong.

I've tested this with several MySQL versions and it does not seem to be
needed now, the INFORMATION SCHEMA works correctly even if some of the
database directories have wrong permissions.

Signed-off-by: Michal Čihař <michal@cihar.com>
Remove no longer used caching configuration

Signed-off-by: Michal Čihař <michal@cihar.com>