Windows system tests fail after Network Manager refactoring

Nearly all system test on Windows fail after !4444 (merged):

01-Dec-2020 20:24:00.891 c:\builds\isc-projects\bind9\lib\isc\netmgr\netmgr.c:2053: unexpected error:
01-Dec-2020 20:24:00.891 socket() failed: Unknown error
01-Dec-2020 20:24:00.891 c:\builds\isc-projects\bind9\lib\isc\netmgr\netmgr.c:178: REQUIRE(result == 0) failed
01-Dec-2020 20:24:00.891 exiting (due to assertion failure)

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