[Perf] High Allocator SocketOutput.Write

[benaadams]

Drill down on Issue #288
Measurements post PR #287

Item 2 on highest allocators in plaintext test

Microsoft.AspNet.Server.Kestrel.Http.SocketOutput.Write

Allocations (2003 requests)

Bytes (2003 requests)

[benaadams]

Have PR for this coming

[benaadams]

Resolved by #315 "Lockless socket output, lower allocs"

[lodejard]

Closed, resolved by #315 per @benaadams

[benaadams]

@lodejard still open #315 wasn't merged

[benaadams]

Resolved by #363 Resuse writes, initalize queues