Install vagrant-serverspec only if it is not already present
Install vagrant-serverspec only if it is not already present

ambakshi/windows,StefanScherer/windows,c-owens/windows,samepage-labs/windows-templates,MSumulong/windows,StefanScherer/windows,boxcutter/windows,ambakshi/windows,MYOB-Technology/packer-sqlserver,TaylorMonacelli/boxcutter-windows,TaylorMonacelli/boxcutter-windows,c-owens/windows,boxcutter/windows,HirotakaKato/boxcutter-windows-ja,seancoyne/windows,HirotakaKato/boxcutter-windows-ja,HirotakaKato/boxcutter-windows-ja,quarkslab/windows,ambakshi/windows,TaylorMonacelli/boxcutter-windows,c-owens/windows,quarkslab/windows,TaylorMonacelli/boxcutter-windows,seancoyne/windows,quarkslab/windows,samepage-labs/windows-templates,MSumulong/windows,boxcutter/windows,samepage-labs/windows-templates,MSumulong/windows,StefanScherer/windows,seancoyne/windows