DHCP improvements + TCP fix #94

Job	Run time
build	11m 0s
test (BoxingTests.Kernel)	9m 50s
test (Cosmos.Compiler.Tests.TypeSystem.Kernel)	10m 16s
test (Cosmos.Compiler.Tests.Bcl.Kernel)	4m 35s
test (Cosmos.Compiler.Tests.Bcl.System.Kernel)	5m 12s
test (Cosmos.Compiler.Tests.Exceptions.Kernel)	6m 35s
test (Cosmos.Compiler.Tests.MethodTests.Kernel)	3m 4s
test (Cosmos.Compiler.Tests.SingleEchoTest.Kernel)	8m 33s
test (Cosmos.Kernel.Tests.Fat.Kernel)	19m 51s
test (Cosmos.Kernel.Tests.IO.Kernel)	8m 18s
test (SimpleStructsAndArraysTest.Kernel)	1s
test (Cosmos.Kernel.Tests.DiskManager.Kernel)	10m 36s
test (GraphicTest.Kernel)	10m 33s
test (NetworkTest.Kernel)	3m 18s
test (AudioTests.Kernel)	8m 15s
test (MemoryOperationsTest.Kernel)	5m 7s
test (ProcessorTests.Kernel)	3s
	2h 5m 7s

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