Invert username metrics handling options#8
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Backport of changes submitted to upstream.
sysvinit
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Nov 8, 2022
```
==6418==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x4e7530 in bcmp /src/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:906:10
#1 0x55463d in stun_check_message_integrity_by_key_str coturn/src/client/ns_turn_msg.c:1989:5
#2 0x554acc in stun_check_message_integrity_str coturn/src/client/ns_turn_msg.c:2008:9
#3 0x5358c0 in LLVMFuzzerTestOneInput coturn/fuzz/FuzzStun.c:37:5
#4 0x43ede3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#5 0x42a542 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
#6 0x42fdec in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9
#7 0x459322 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
#8 0x7f4cb21790b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
#9 0x42070d in _start
Uninitialized value was created by an allocation of 'new_hmac' in the stack frame of function 'stun_check_message_integrity_by_key_str'
#0 0x5538c0 in stun_check_message_integrity_by_key_str coturn/src/client/ns_turn_msg.c:1927
```
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This is a backport of changes submitted upstream in coturn#919, which inverts the logic of the options for controlling username labeling on Prometheus metrics.