[Http] [Test] Fix test failures on shutdown #3472

Job	Run time
lint	1m 4s
CMake-Linux	17m 2s
Native-x64-Linux	34m 33s
CMake-Linux-latest	16m 44s
Depends-ARM 32-bit	1m 20s
Native-x64-Linux-latest	31m 26s
CMake-macOS	36m 29s
Depends-AARCH64	1m 33s
Native-x64-macOS	53m 26s
CMake-macOS-latest	25m 35s
Depends-Win64	1m 28s
Native-x64-macOS-latest	35m 20s
Depends-32-bit + dash	1m 21s
Depends-x86_64 Linux	1m 42s
Depends-macOS 10.12	1m 20s
ARM 32-bit [GOAL:install] [no unit or functional tests]	18m 57s
AARCH64 [GOAL:install] [no unit or functional tests]	20m 50s
Win64 [GOAL:deploy] [no unit or functional tests]	22m 2s
x86_64 Linux [GOAL:install]	29m 1s
x86_64 Linux [GOAL:install] [no GUI, no unit tests, only functional tests on legacy pre-HD wallets]	17m 33s
macOS 10.12 [GOAL:deploy] [no unit or functional tests]	16m 13s
	6h 24m 59s

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