[BUGFIX] Extension Import not working with postgresql and DBAL

Do additional code style cleanups on the go.

Change-Id: I6d8732b7b4c979a96b4847a85e3aea52db01fbd3
Fixes: #38406
Releases: 6.0, 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/12898
Reviewed-by: Wouter Wolters
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel