db_testing: improve doc and naming conventions (minor)
db_testing: improve doc and naming conventions (minor)

matthieucan/debsources,matthieucan/debsources,clemux/debsources,zacchiro/debsources,devoxel/debsources,oorestisime/debsources,Debian/debsources,zacchiro/debsources,clemux/debsources,Debian/debsources,zacchiro/debsources,matthieucan/debsources,sophiejjj/debsources,devoxel/debsources,oorestisime/debsources,zacchiro/debsources,vivekanand1101/debsources,sophiejjj/debsources,oorestisime/debsources,Debian/debsources,nonas/debian-qa,clemux/debsources,matthieucan/debsources,zacchiro/debsources,Debian/debsources,clemux/debsources,vivekanand1101/debsources,oorestisime/debsources,devoxel/debsources,matthieucan/debsources,devoxel/debsources,clemux/debsources,vivekanand1101/debsources,vivekanand1101/debsources,sophiejjj/debsources,vivekanand1101/debsources,sophiejjj/debsources,devoxel/debsources,oorestisime/debsources,Debian/debsources,nonas/debian-qa,nonas/debian-qa,sophiejjj/debsources,nonas/debian-qa