EMULATE=1 not concurrency safe #17555
Description
Description
The emulation machinery is using fixed port numbers / socket files for serial and monitor sockets, which makes them unusable in the parallel case (e.g., CI).
Could it use per-application socket files?
#17434 is blocked on this.
Steps to reproduce the issue
Run two instances of EMULATE=1 make test for e.g., microbit.
Expected results
Test passes.
Actual results
/tmp/dwq.0.5048392832189235/a33c1c69a48300216f746cb52394974e/dist/tools/emulator/term.sh qemu microbit /tmp/dwq.0.5048392832189235/a33c1c69a48300216f746cb52394974e/tests/xtimer_usleep /tmp/dwq.0.5048392832189235/a33c1c69a48300216f746cb52394974e/dist/tools/pyterm/pyterm '-p "/tmp/riot_tests_xtimer_usleep_microbit_uart" -b "115200" ' /tmp/riot_tests_xtimer_usleep_microbit_uart
qemu-system-arm -machine microbit -device loader,file=/tmp/dwq.0.5048392832189235/a33c1c69a48300216f746cb52394974e/build/tests_xtimer_usleep.elf -serial telnet::5555,server,nowait,nodelay -monitor telnet::45454,server,nowait -nographic
qemu-system-arm: -monitor telnet::45454,server,nowait: Failed to find an available port: Address already in use
make[2]: *** [/tmp/dwq.0.5048392832189235/a33c1c69a48300216f746cb52394974e/Makefile.include:853: emulate] Error 1
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