Update vmtools branch logic to reflect new providers in packer 0.5.1-
Update vmtools branch logic to reflect new providers in packer 0.5.1-

New providers in packer 0.5.1 are
- virtualbox-iso/ovf and
- vmware-iso/ovf
instead of the former „naked“ virtualbox and vmware.

dthtvwls/bento,mmckinst/bento,dthtvwls/bento,117111302/bento,ammonkc/vm-packer,brianm/baseboxes,pingworks/bento,sporting-news/bento,norcams/bento,leohmoraes/bento,RallySoftware-cookbooks/bento,b1-systems/bento,chef/bento,patrickmcclory/bento,bgandon/bento,Oefenweb/bento,devopxteam/bento,osuosl/bento,loadsys/packer-builds,orpiske/bento,rickard-von-essen/bento,orpiske/bento,lwieske/bento,mtnsat/bento,William-Yeh/bento,ConSol/bento,Sauraus/bento,chef/bento,ConSol/bento,legal90/bento,v1k0d3n/bento,jhoblitt/bento,mtnsat/bento,lwieske/bento,mmckinst/bento,devopxteam/bento,erikj/bento,risdenk/bento,pingworks/bento,thinktainer/bento,legal90/bento,runsystem-hiennt2/bento,b1-systems/bento,patrickmcclory/bento,erikj/bento,vincentaubert/bento,davidalger/bento,jhoblitt/bento,leejones/bento,vincentaubert/bento,thinktainer/bento,tas50/bento,stumped2/packer,dmlb2000/bento,devopxteam/bento,ConSol/bento,loadsys/packer-builds,117111302/bento,techmaniack/bento,rickard-von-essen/bento,Oefenweb/bento,Sauraus/bento,leohmoraes/bento,stumped2/packer,bgandon/bento,0x90/bento,tas50/bento,sillvan/bento,osuosl/bento,patcon/bento,norcams/bento,sporting-news/bento,patcon/bento,techmaniack/bento,devopxteam/bento,vincentaubert/bento,juliandunn/bento,josephholsten/bento,leejones/bento,brianm/baseboxes,lwieske/bento,josephholsten/bento,William-Yeh/bento,mkristiansen/bento,legal90/bento,mkristiansen/bento,ammonkc/vm-packer,juliandunn/bento,loadsys/packer-builds,RallySoftware-cookbooks/bento,tas50/bento,geoHeil/packerPuphetPuppet,geoHeil/packerPuphetPuppet,grdryn/bento,v1k0d3n/bento,davidalger/bento,norcams/bento,juliandunn/bento,sillvan/bento,risdenk/bento,someara/bento,chef/bento,0x90/bento,runsystem-hiennt2/bento,grdryn/bento,someara/bento,dmlb2000/bento,techmaniack/bento