Commits on May 29, 2019

1. Rework DeviceGuard to restore original context upon the exit …

   - some libraries are not using PrimiarContext while DALI does. When
     cudaSetDevice is called PrimaryContext is created and is set as
     the current one, the old one is lost while other apps may still need it.
     Adds saving of current context and restores it when DeviceGuard
     is destroyed
   - removed CUContext as it is not needed and can be replaced by the DeviceGuard
   
   Signed-off-by: Janusz Lisiecki <jlisiecki@nvidia.com>

   

   JanuszL committed May 29, 2019
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