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Andrew Dunham 8d3acc9235 util/sysresources, magicsock: scale DERP buffer based on system memory 
This adds the util/sysresources package, which currently only contains a
function to return the total memory size of the current system.

Then, we modify magicsock to scale the number of buffered DERP messages
based on the system's available memory, ensuring that we never use a
value lower than the previous constant of 32.

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: Ib763c877de4d0d4ee88869078e7d512f6a3a148d
..
memory.go util/sysresources, magicsock: scale DERP buffer based on system memory
memory_bsd.go util/sysresources, magicsock: scale DERP buffer based on system memory
memory_darwin.go util/sysresources, magicsock: scale DERP buffer based on system memory
memory_linux.go util/sysresources, magicsock: scale DERP buffer based on system memory
memory_unsupported.go util/sysresources, magicsock: scale DERP buffer based on system memory
sysresources.go util/sysresources, magicsock: scale DERP buffer based on system memory
sysresources_test.go util/sysresources, magicsock: scale DERP buffer based on system memory