getdata block requests continue to be sent for a short while after shutdown is requested, according to my debug.log:-
2016-12-14 04:17:02.186618 Interrupt: Setting fRequestShutdown to true
2016-12-14 04:17:02.242689 recv block 000000000000000001308dd3497017f3054bd962872c74dc05bf87a4c1be896d (427478) age=106.0days size=946949 peer=0
2016-12-14 04:17:02.288464 BLOCKED - count (1) reached peer=0
2016-12-14 04:17:02.288568 send getdata block 0000000000000000039213c4a24d056ce0892f9b64fa1d51ca9138db99f991d6 (427755) age=104.0days peer=0
2016-12-14 04:17:02.290855 BLOCKED - count (5) reached peer=13
2016-12-14 04:17:02.290919 send getdata block 0000000000000000025f0e34d50dbd6c48817a9f39af8f74cddf5e628c8bfebe (427762) age=104.0days peer=13
2016-12-14 04:17:02.290969 send getdata block 000000000000000003674eab9860bf52bb23c16323ea6493067571de30c59089 (427767) age=103.9days peer=13
2016-12-14 04:17:02.291016 send getdata block 000000000000000002c738515d37c408f23880b2b28587daf8dfefb439e906de (427772) age=103.9days peer=13
2016-12-14 04:17:02.291061 send getdata block 0000000000000000031e6258d0258f299d07c991e51f7fed3b465a30ecc05582 (427777) age=103.9days peer=13
2016-12-14 04:17:02.291114 send getdata block 000000000000000000937b7ca9b7753eea5d3b572a39ebaac8e2e645942fdb02 (427782) age=103.8days peer=13
2016-12-14 04:17:02.345097 recv block 0000000000000000026f824276aad5948f3fd84f5790eeab9a186c38ebda8499 (427325) age=107.0days size=710333 peer=13
2016-12-14 04:17:02.443337 Interrupting HTTP RPC server
2016-12-14 04:17:02.491357 Incoming block (464916 of 721607 bytes) chk=5e526b36 from peer=13
2016-12-14 04:17:02.531167 Interrupting RPC
2016-12-14 04:17:02.613689 recv block 000000000000000004b72fd635e25022a63c2c04c28e80d97e2dcc7feadc59b7 (427445) age=106.1days size=998199 peer=21
2016-12-14 04:17:02.659374 BLOCKED - count (1) reached peer=21
2016-12-14 04:17:02.659474 send getdata block 0000000000000000042f305fe2a1dcaa2ea0886a045b056d40aea81f15490765 (427759) age=104.0days peer=21
2016-12-14 04:17:02.764973 Incoming block (70056 of 998219 bytes) chk=885412c0 from peer=0
2016-12-14 04:17:02.831709 tor: Thread interrupt
2016-12-14 04:17:02.831834 RemoveLocal(j2hehmestxfpylx4.onion:8333)
2016-12-14 04:17:02.925820 torcontrol thread exit
2016-12-14 04:17:03.126485 addcon thread interrupt
2016-12-14 04:17:03.126534 scheduler thread interrupt
2016-12-14 04:17:03.126600 net thread interrupt
2016-12-14 04:17:03.126652 msghand thread interrupt
2016-12-14 04:17:03.249263 opencon thread interrupt
2016-12-14 04:17:03.269874 Shutdown: In progress...
2016-12-14 04:17:03.269985 Stopping HTTP RPC server
2016-12-14 04:17:03.284170 Stopping RPC
2016-12-14 04:17:03.284937 RPC stopped.
2016-12-14 04:17:03.325594 Stop
2016-12-14 04:17:03.325687 Flushing 872 addresses to peers.dat...
2016-12-14 04:17:04.464104 Flushed 872 addresses to peers.dat 1138ms
2016-12-14 04:17:04.669715 Dumped mempool: 0.013966s to copy, 0.061317s to dump
2016-12-14 04:17:06.236354 Shutdown: done
will submit a PR to fix this shortly