Added windows 8.1 32-bit support, standardized .json files

Changelog:

Added `"scsi0.virtualDev": "lsisas1068"`, where missing
Removed `script/change-home-dirs.sh`, as it duplicates code in `postinstall*.sh`
Moved `"ssh_wait_timeout": "10000s"` to standard location
Changed `ethernet0.virtualDev` to `vmxnet3` (as `e1000` is not supported by Windows 8.1 32-bit)
Mounted `windows.iso` as drive E:, so VMWare Tools can be installed via Autounattend.xml (so `vmxnet3` driver works in Windows 8.1 32-bit)
Added `"guestOS": "windows8"` for Windows 8.1 32-bit, as `windows8-64` was being selected by default

I tested these changes, and the boxes

win2008r2-datacenter
win2008r2-enterprise
win2008r2-standard
win2008r2-web
win2012-standard
win2012r2-standard
win7x64-enterprise
win7x64-pro
win7x86-enterprise
win7x86-pro
win81x64-enterprise
win81x64-pro
win8x64-enterprise
win8x86-enterprise
win81x86-enterprise
win81x86-pro

successfully install OpenSSH, and VMWare Tools.

The boxes

win2012-datacenter
win2012r2-datacenter

***sometimes*** fail to build, as the sshd service logs the following error when it's started:

`sshd pid service sshd failed signal 11 raised`