Add cake-build build.cake NuGet restore retry handling

[devlead]

We currently experience allot of hangs/timeouts/etc. during NuGet restore on Linux / OSX build agents, forcing us often to retry PR builds several times.

Cake v0.11.0 introduced a timeout setting to all tools using this and an something like Polly we should be able to do retries while restoring packages and eliminate some frustration.

I'll shortly submit a WIP PR with to implement this.