net: increase network family autoselection timeout to 500ms #606

Job	Run time
Build slim tarball	1m 38s
x86_64-linux: with shared libraries	2h 4m 29s
x86_64-darwin: with shared libraries	1s
aarch64-darwin: with shared libraries	2h 9m 32s
aarch64-linux: with shared libraries	1h 56m 27s
	6h 12m 7s

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