engine: RFE: set locale language and keyboard via Sysprep

We want to add ability for the user to specify the language layout via
Windows Sysprep, added 4 new fields that represented the following
Sysprep data:
   <InputLocale>en-US</InputLocale>
   <UILanguage>en-US</UILanguage>
   <SystemLocale>en-US</SystemLocale>
   <UserLocale>en-US</UserLocale>

Change-Id: I414c1d097a7cf8e23b322ca0f23dcb9d66ac0691
Signed-off-by: Shahar Havivi <shaharh@redhat.com>