Small refactoring of "exec_pip_commands".
Small refactoring of "exec_pip_commands".

jakedotio/gae-init,jakedotio/gae-init,lipis/life-line,gae-init/gae-init-babel,topless/gae-init-upload,NeftaliYagua/gae-init,wilfriedE/gae-init,mdxs/gae-init,gae-init/gae-init-debug,NeftaliYagua/gae-init,gmist/five-studio2,gmist/fix-5studio,lipis/electron-crash-reporter,lipis/github-stats,terradigital/gae-init,mdxs/gae-init,lipis/gae-init,wodore/wodore-gae,gmist/my-gae-init,gmist/nashi-5studio,vanessa-bell/hd-kiosk-v2,lipis/the-smallest-creature,gae-init/gae-init-babel,lipis/gae-init,topless/gae-init,lipis/github-stats,mdxs/gae-init-babel,lipis/meet-notes,lipis/github-stats,gae-init/gae-init-upload,lovesoft/gae-init,georgekis/salary,mdxs/gae-init,gae-init/gae-init-upload,gmist/fix-5studio,gmist/five-studio2,d4rr3ll/gae-init-docker,gmist/five-studio2,lovesoft/gae-init,gmist/1businka2,mdxs/gae-init-babel,gmist/alice-box,lipis/electron-crash-reporter,wilfriedE/gae-init,lipis/guestbook,lipis/meet-notes,gae-init/gae-init-docs,gae-init/gae-init-upload,mdxs/gae-init-docs,jakedotio/gae-init,gae-init/gae-init-babel,topless/gae-init,dhstack/gae-init,topless/gae-init,gmist/five-studio2,gmist/fix-5studio,vanessa-bell/hd-kiosk-v2,tiberiucorbu/av-website,gae-init/gae-init-docs,topless/gae-init-upload,vanessa-bell/hd-kiosk-v2,wodore/wodore-gae,lovesoft/gae-init,gmist/ctm-5studio,gae-init/gae-init-debug,gae-init/gae-init-docs,d4rr3ll/gae-init-docker,gmist/my-gae-init,gmist/1businka2,lipis/electron-crash-reporter,gae-init/gae-init-upload,lipis/the-smallest-creature,georgekis/salary,jakedotio/gae-init,gae-init/gae-init-babel,d4rr3ll/gae-init-docker,gmist/ctm-5studio,gmist/ctm-5studio,lipis/life-line,gmist/my-gae-init,d4rr3ll/gae-init-docker,gae-init/phonebook,terradigital/gae-init,tiberiucorbu/av-website,lipis/the-smallest-creature,topless/gae-init-upload,gae-init/gae-init,georgekis/salary,lipis/gae-init,tiberiucorbu/av-website,gae-init/gae-init-debug,gmist/fix-5studio,gmist/1businka2,dhstack/gae-init,topless/gae-init,vanessa-bell/hd-kiosk-v2,gae-init/gae-init-debug,dhstack/gae-init,terradigital/gae-init,gmist/alice-box,mdxs/gae-init-babel,lipis/gae-init,gmist/nashi-5studio,wodore/wodore-gae,gmist/my-gae-init,lipis/life-line,gmist/my-gae-init-auth,wilfriedE/gae-init,gae-init/gae-init,lipis/github-stats,NeftaliYagua/gae-init,lipis/meet-notes,gae-init/gae-init,gmist/nashi-5studio,wodore/wodore-gae,gae-init/gae-init-docs,gmist/ctm-5studio,mdxs/gae-init,gae-init/gae-init