Remove VS2015 git provider

I was unable to disable VS git provider. When set to 'None' in options at restart of VS it was enabled.

You can totally disable in regedit:
 

Navigate to HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\14.0_Config\SourceControlProviders
 

Delete 11b8e6d7-c08b-4385-b321-321078cdd1f8 This one is the GitProvider but you can delete other ones.