Don't grab all the adb locks at once

Don't grab all the adb locks at once

FATAL: ThreadSanitizer CHECK failed: /build/llvm-toolchain-10-10.0.1~++20200708124224+ef32c611aa2/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h:67 "((n_all_locks_)) < (((sizeof(all_locks_with_contexts_)/sizeof((all_locks_with_contexts_)[0]))))" (0x40, 0x40)
    #0 __tsan::TsanCheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) <null> (named+0x4ad775)
    #1 __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) <null> (named+0x4c429f)
    #2 __sanitizer::DeadlockDetectorTLS<__sanitizer::TwoLevelBitVector<1ul, __sanitizer::BasicBitVector<unsigned long> > >::addLock(unsigned long, unsigned long, unsigned int) <null> (named+0x4b8a3c)
    #3 __sanitizer::DD::MutexAfterLock(__sanitizer::DDCallback*, __sanitizer::DDMutex*, bool, bool) <null> (named+0x4b7fae)
    #4 __tsan::MutexPostLock(__tsan::ThreadState*, unsigned long, unsigned long, unsigned int, int) <null> (named+0x4abc58)
    #5 pthread_mutex_lock <null> (named+0x4643a8)
    #6 dump_adb /builds/isc-projects/bind9/lib/dns/adb.c:3461:3 (libdns.so.1110+0x48be6)
    #7 dns_adb_dump /builds/isc-projects/bind9/lib/dns/adb.c:3434:2 (libdns.so.1110+0x48738)
    #8 dumpdone /builds/isc-projects/bind9/bin/named/./server.c:10149:4 (named+0x512022)
    #9 dump_quantum /builds/isc-projects/bind9/lib/dns/masterdump.c:1424:2 (libdns.so.1110+0x9f253)
    #10 dispatch /builds/isc-projects/bind9/lib/isc/task.c:1157:7 (libisc.so.1107+0x50845)
    #11 run /builds/isc-projects/bind9/lib/isc/task.c:1331:2 (libisc.so.1107+0x4d799)
    #12 __tsan_thread_start_func <null> (named+0x446e3c)
    #13 start_thread /build/glibc-vjB4T1/glibc-2.28/nptl/pthread_create.c:486:8 (libpthread.so.0+0x7fa2)
    #14 clone /build/glibc-vjB4T1/glibc-2.28/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95 (libc.so.6+0xf94ce)