Fog::Vsphere::Compute - misspelled method 'get_vm_by_ref' in vm_reconfig_hardware

Method 'get_vm_by_ref' should be 'get_vm_ref' in vm_reconfig_hardware.rb, when run by default it returns 'NoMethodError' for 'get_vm_by_ref' because it doesn't exist anywhere.
Merge pull request #1577 from tipt0e/master

Fog::Compute::Vsphere get_vm_by_ref method is misspelled in vm_reconfig_hardware