list_pkgs became quiet

I think, there's no need to see all these lines in debug log when interacting with package managers:
```
------------- Truncated -----------------------
install ok installed libqtcore4 4:4.8.4+dfsg-0ubuntu18 i386
install ok installed libqtgui4 4:4.8.4+dfsg-0ubuntu18 amd64
install ok installed libqtgui4 4:4.8.4+dfsg-0ubuntu18 i386
install ok installed libqtwebkit4 2.3.2-0ubuntu3 amd64
install ok installed libqtwebkit4 2.3.2-0ubuntu3 i386
install ok installed libquadmath0 4.8.1-10ubuntu9 amd64
install ok installed libquvi-scripts 0.4.18-1 all
install ok installed libquvi7 0.4.1-1ubuntu2 amd64
install ok installed libraptor2-0 2.0.9-1 amd64
install ok installed librarian0 0.8.1-5build1 amd64
install ok installed librasqal3 0.9.30-1 amd64
install ok installed libraw1394-11 2.1.0-1 amd64
deinstall ok config-files libraw1394-11 2.1.0-1 i386
deinstall ok config-files libraw5 0.14.7-0ubuntu1.13.04.2 amd64
install ok installed libraw9 0.15.3-1ubuntu1 amd64
install ok installed librdf0 1.0.16-1 amd64
install ok installed libreadline5 5.2+dfsg-2 amd64
install ok installed libreadline6 6.2-9ubuntu1 amd64
deinstall ok config-files libreadline6 6.2-9ubuntu1 i386
install ok installed libreoffice-base-core 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-calc 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-common 1:4.1.3-0ubuntu1 all
install ok installed libreoffice-core 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-draw 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-emailmerge 1:4.1.3-0ubuntu1 all
install ok installed libreoffice-gnome 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-gtk 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-help-en-us 1:4.1.3-0ubuntu1 all
install ok installed libreoffice-impress 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-math 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-ogltrans 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-pdfimport 1:4.1.3-0ubuntu1 amd64
install ok installed libreoffice-presentation-minimizer 1.0.4+LibO4.1.3-0ubuntu1 amd64
install ok installed libreoffice-presenter-console 1:4.1.3-0ubuntu1 all
install ok installed libreoffice-style-human 1:4.1.3-0ubuntu1 all
install ok installed libreoffice-style-tango 1:4.1.3-0ubuntu1 all
install ok installed libreoffice-writer 1:4.1.3-0ubuntu1 amd64
install ok installed libresid-builder0c2a 2.1.1-14 amd64
install ok installed librest-0.7-0 0.7.90-0ubuntu1 amd64
deinstall ok config-files librhythmbox-core6 2.98-0ubuntu5 amd64
install ok installed librhythmbox-core7 2.99.1-0ubuntu1 amd64
install ok installed libroken18-heimdal 1.6~git20120403+dfsg1-3ubuntu0.1 amd64
deinstall ok config-files libroken18-heimdal 1.6~git20120403+dfsg1-3ubuntu0.1 i386
install ok installed librsvg2-2 2.36.4-2 amd64
------------- Truncated -----------------------
```