Driver works in YARN container #119
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When running in a container, the driver may need to configure Netty's native working directory, as not all filesystems have executable /tmp. Since netty cleans up after itself, we set it to the current directory if we're in a container.
Makes `skein.Security.from_default()` use the current application's security credentials when run inside a container. This is needed to make the skein driver work properly inside a container.
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Two fixes to make the Skein driver/client work properly inside a YARN container:
io.netty.native.workdirfor the driver as well as the application masterThis allows applications to be submitted from inside a YARN container just as easily as from the edge node.