Pause dbiterator to release rwlock to prevent lock-order-inversion.

Pause dbiterator to release rwlock to prevent lock-order-inversion.

    WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)
    Cycle in lock order graph: M1 (0x000000000000) => M2 (0x000000000001) => M1

    Mutex M2 acquired here while holding mutex M1 in thread T1:
    #0 pthread_rwlock_rdlock <null>
    #1 isc_rwlock_lock lib/isc/rwlock.c:48:3
    #2 getsigningtime lib/dns/rbtdb.c:8198:2
    #3 dns_db_getsigningtime lib/dns/db.c:979:11
    #4 set_resigntime lib/dns/zone.c:3887:11
    #5 dns_zone_markdirty lib/dns/zone.c:11119:4
    #6 update_action lib/ns/update.c:3376:3
    #7 dispatch lib/isc/task.c:1152:7
    #8 run lib/isc/task.c:1344:2

    Mutex M1 previously acquired by the same thread here:
    #0 pthread_mutex_lock <null>
    #1 dns_zone_markdirty lib/dns/zone.c:11089:2
    #2 update_action lib/ns/update.c:3376:3
    #3 dispatch lib/isc/task.c:1152:7
    #4 run lib/isc/task.c:1344:2

    Mutex M1 acquired here while holding mutex M2 in thread T1:
    #0 pthread_mutex_lock <null>
    #1 zone_nsec3chain lib/dns/zone.c:8502:3
    #2 zone_maintenance lib/dns/zone.c:11056:4
    #3 zone_timer lib/dns/zone.c:14091:2
    #4 dispatch lib/isc/task.c:1152:7
    #5 run lib/isc/task.c:1344:2

    Mutex M2 previously acquired by the same thread here:
    #0 pthread_rwlock_rdlock <null>
    #1 isc_rwlock_lock lib/isc/rwlock.c:48:3
    #2 resume_iteration lib/dns/rbtdb.c:9357:2
    #3 dbiterator_current lib/dns/rbtdb.c:9695:3
    #4 dns_dbiterator_current lib/dns/dbiterator.c:101:10
    #5 zone_nsec3chain lib/dns/zone.c:8539:3
    #6 zone_maintenance lib/dns/zone.c:11056:4
    #7 zone_timer lib/dns/zone.c:14091:2
    #8 dispatch lib/isc/task.c:1152:7
    #9 run lib/isc/task.c:1344:2

    Thread T1 (running) created by main thread at:
    #0 pthread_create <null>
    #1 isc_thread_create lib/isc/pthreads/thread.c:73:8
    #2 isc_taskmgr_create lib/isc/task.c:1434:3
    #3 create_managers bin/named/main.c:915:11
    #4 setup bin/named/main.c:1223:11
    #5 main bin/named/main.c:1523:2

    SUMMARY: ThreadSanitizer: lock-order-inversion (potential deadlock) in pthread_rwlock_rdlock

(cherry picked from commit fbed96220486a063aafdd0a6ada8adce972fd48f)