bundlebuilder: refactor get_files_git to Packager to avoid code duplication
bundlebuilder: refactor get_files_git to Packager to avoid code duplication

Follow up patch for b582736375218e8944b3ce3daac667c7910a7e73

Signed-off-by: Simon Schampijer <088e16a1019277b15d58faf0541e11910eb756f6@laptop.org>
Reviewed-by: Daniel Drake <83b0c3d63e8a11eb6e40077030b59e95bfe31ffa@laptop.org>
Acked-by: Sascha Silbe <be4224c72adedf72d459320ee497e22a37089288@activitycentral.com>

ceibal-tatu/sugar-toolkit,sugarlabs/sugar-toolkit,samdroid-apps/sugar-toolkit-gtk3,manuq/sugar-toolkit-gtk3,Daksh/sugar-toolkit-gtk3,ceibal-tatu/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit,manuq/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit,puneetgkaur/backup_sugar_sugartoolkit,quozl/sugar-toolkit-gtk3,gusDuarte/sugar-toolkit-gtk3,i5o/sugar-toolkit-gtk3,puneetgkaur/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit-gtk3,ceibal-tatu/sugar-toolkit,sugarlabs/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit-gtk3,Daksh/sugar-toolkit-gtk3,tchx84/sugar-toolkit-gtk3,gusDuarte/sugar-toolkit-gtk3,i5o/sugar-toolkit-gtk3,tchx84/sugar-toolkit-gtk3,puneetgkaur/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,puneetgkaur/backup_sugar_sugartoolkit,manuq/sugar-toolkit-gtk3,samdroid-apps/sugar-toolkit-gtk3,gusDuarte/sugar-toolkit-gtk3,i5o/sugar-toolkit-gtk3,godiard/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit,godiard/sugar-toolkit-gtk3,i5o/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit,tchx84/sugar-toolkit-gtk3,puneetgkaur/backup_sugar_sugartoolkit,sugarlabs/sugar-toolkit,ceibal-tatu/sugar-toolkit-gtk3,tchx84/debian-pkg-sugar-toolkit-gtk3,godiard/sugar-toolkit-gtk3,puneetgkaur/sugar-toolkit-gtk3,ceibal-tatu/sugar-toolkit,sugarlabs/sugar-toolkit,samdroid-apps/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,gusDuarte/sugar-toolkit-gtk3,sugarlabs/sugar-toolkit-gtk3,quozl/sugar-toolkit-gtk3,Daksh/sugar-toolkit-gtk3,ceibal-tatu/sugar-toolkit-gtk3,samdroid-apps/sugar-toolkit-gtk3