Split out fake networking from fetch logic

Splits out the ethernet / tcp emulation logic
from the fetch networking adapter for reuse
in wisp.

Makefile

@@ -87,7 +87,7 @@ CORE_FILES=const.js config.js io.js main.js lib.js buffer.js ide.js pci.js flopp
 LIB_FILES=9p.js filesystem.js jor1k.js marshall.js utf8.js
 BROWSER_FILES=screen.js keyboard.js mouse.js speaker.js serial.js \
 	      network.js starter.js worker_bus.js dummy_screen.js \
-	      fetch_network.js print_stats.js filestorage.js
+	      fake_network.js fetch_network.js print_stats.js filestorage.js
 
 RUST_FILES=$(shell find src/rust/ -name '*.rs') \
 	   src/rust/gen/interpreter.rs src/rust/gen/interpreter0f.rs \

debug.html

@@ -13,7 +13,7 @@
     "memory.js dma.js pit.js vga.js ps2.js rtc.js uart.js acpi.js apic.js ioapic.js sb16.js " +
     "ne2k.js state.js virtio.js virtio_console.js bus.js elf.js kernel.js";
 
-var BROWSER_FILES = "main.js screen.js keyboard.js mouse.js speaker.js serial.js network.js fetch_network.js starter.js worker_bus.js print_stats.js filestorage.js";
+var BROWSER_FILES = "main.js screen.js keyboard.js mouse.js speaker.js serial.js network.js fake_network.js fetch_network.js starter.js worker_bus.js print_stats.js filestorage.js";
 var LIB_FILES = "";
 
 // jor1k stuff