Guard e2e tun and udp channels on close #1428

Job	Run time
Build all and test on ubuntu-linux	2m 2s
Build all and test on ubuntu-linux	1m 57s
Build all and test on ubuntu-linux	1m 52s
Build and test on linux with boringcrypto	2m 5s
Build and test on linux with boringcrypto	2m 2s
Build and test on linux with boringcrypto	1m 56s
Build and test on windows-latest	6m 18s
Build and test on windows-latest	2m 45s
Build and test on windows-latest	2m 32s
Build and test on macos-11	2m 18s
Build and test on macos-11	2m 14s
Build and test on macos-11	2m 18s
	30m 19s

Provide feedback