Lasse Reedtz

update protobuf version

4

**What this PR does / why we need it**: This is to get to the new version of protobuf with significantly better parsing performance than previous releases, especially for large...

When having to big a batch size i get the following error: ``` terminate called after throwing an instance of 'std::runtime_error' what(): src/nnet/pool_b01.cu:50: invalid configuration argument /var/spool/torque/mom_priv/jobs/847742.hnode2.SC: line 25: 20375...

/kind feature **Describe the solution you'd like** Upgrade the version of protobuf to gain significantly better parsing performance than previous releases, especially for large payloads. **Anything else you would like...