Ignore all errors in vimrc at vim startup

You can silence the E185: Cannot find color scheme 'molokai' error in your .vimrc by setting silent! colorscheme molokai then install with i.e.: vim -E -s -u ~/.vimrc +PlugInstall +qall.

Possibly you could split your vundler config into its own file vundler.vim, and on your first startup/ansible script you instead run vim -u vundler.vim (you can make it run :VundleInstall or whatever else would be required via some commandline flags too, -E?).

Then in your regular vimrc you just source vundler.vim for your regular day to day usage.