Fix various memory leaks

main/config.c - cleanup cache fie includes
res/res_security_log.c - unregister logger level
channesl/chan_sip.c - cleanup io context and notify_types

(closes issues ASTERISK-22378)
Reported by: Corey Farrell
Patches:
     config_shutdown.patch uploaded by coreyfarrell (license 5909)
     res_security_log.patch uploaded by coreyfarrell (license 5909)
     chan_sip-1.8.patch uploaded by coreyfarrell (license 5909)


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@398102 f38db490-d61c-443f-a65b-d21fe96a405b