[enhancement request] More verbose mode for multivms configurations

[davidfrigola]

When using sahara with a multivm config Vagrantfile get something like:

-- vagrant sandbox commit
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

(running 3 VMs)
It will be great if we can get something like:

-- vagrant sandbox commit
[VM1 temp del] 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
[VM2 temp del] 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
[VM3 temp del] 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
[VM1 commit] 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
[VM2 commit] 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
[VM3 commit] 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

[ryuzee]

see #40