tm-threads: fix memleak

tm-threads: fix memleak

Fix cleaning of threads where mutex and condition where not freed.

This fixes:

352 (192 direct, 160 indirect) bytes in 4 blocks are definitely lost in loss record 301 of 327
   at 0x4C29C0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x909404: TmThreadInitMC (tm-threads.c:1764)
   by 0x908DE7: TmThreadCreate (tm-threads.c:1120)
   by 0x90A326: TmThreadCreateMgmtThread (tm-threads.c:1183)
   by 0x4CA0AD: StatsSpawnThreads (counters.c:856)
   by 0x87F254: UnixSocketPcapFilesCheck (runmode-unix-socket.c:396)
   by 0x910330: UnixCommandBackgroundTasks (unix-manager.c:430)
   by 0x9140DD: UnixManager (unix-manager.c:980)
   by 0x9077F3: TmThreadsManagement (tm-threads.c:600)
   by 0x68DE283: start_thread (pthread_create.c:333)
   by 0x80A6A4C: clone (in /lib/x86_64-linux-gnu/libc-2.21.so)