PR-1675: Confusing error message shown when trying to start a VM on a pool where the required vGPU cannot be allocated
-Editing/Adding new friendly error messages

Signed-off-by: Gabor Apati-Nagy <gabor.apati-nagy@citrix.com>
Merge pull request #145 from GaborApatiNagy/xs64bit

PR-1675: Confusing error message shown when trying to start a VM on a po...