Vm miscellaneous

[anuchandy]

1. Renaming few withers to have better consistency (disableVmAgent() -> withoutVmAgent())
2. Make password required for Windows and password or SSH required for Linux
3. Adding support for custom data Define vm with custom data #1246
4. Enable user to specify computer name
5. Fix the bug of associating availability set to creatable resource group Failed to create Virtual Machine with new resource group and new availability set #1239
6. unit tests

Compact break from beta-3

• 6e9ef72
  • Renamed disableVmAgent to withoutVmAgent
  • Renamed disableAutoUpdate to withoutAutoUpdate
  • Removed withPassword and introduced separate methods withRootPassword and withAdminPassword
  • withPassword used to be an optional setter, but the new withAdminPassword is a required stage in case of Windows and withRootPassword or withSsh is required for Linux
  • withRootUserName renamed as withRootUsername

[martinsawicki]

for whatever we're changing from beta3, can you pls add the compat-breaks label to this PR and list the changes in the comments, for example: #1178, #1140, #1090, etc.