Make host:port argument optional #5278

Job	Run time
quiche_windows (x86_64-pc-windows-msvc)	5m 40s
quiche_ios (x86_64-apple-ios)	1m 24s
quiche	3m 22s
quiche_windows (i686-pc-windows-msvc)	4m 22s
quiche_ios (aarch64-apple-ios)	1m 30s
quiche_macos (macos-13)	3m 38s
quiche (boringssl-boring-crate)	3m 38s
quiche_windows (x86_64-pc-windows-gnu)	6m 3s
quiche_macos (macos-latest)	1m 47s
quiche (openssl)	3m 38s
quiche_windows (i686-pc-windows-gnu)	5m 48s
docker	3m 13s
http3_test	1m 5s
nginx (1.16.1)	56s
quiche_multiarch (aarch64-unknown-linux-gnu)	3m 15s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	3m 25s
android_ndk_lts (aarch64-linux-android)	1m 27s
quiche_multiarch (i686-unknown-linux-gnu)	1m 57s
android_ndk_lts (armv7-linux-androideabi)	1m 17s
android_ndk_lts (x86_64-linux-android)	1m 5s
android_ndk_lts (i686-linux-android)	1m 31s
	1h 0m 1s

Provide feedback