ethernet.c: fix Coverity buffer overflow
.gitignore: ignore *.d.* temp depends files
re_utils: move it from pcre_utils for future usage of re2
.gitmodules: remove broken git-hg
sdn_sensor: external: add re2 and cre2
install-debian-dependencies.bash: add llvm-gcc for re2 and cre2
setup-re2.bash: script to setup re2 and cre2
install-debian-dependencies.bash: move to setup-debian.bash
setup-debian.bash: include perl SHA1 functions
sdn_sensor.json: move token extraction regexes to re2 regex engine
update-header-file.pl: check hashes for file change before overwrite
Makefile: add libcre2 to link lib list
common.c: do not destroy nn_queue if parent object is NULL (segfault)
extractor.c: move regex backends to re_utils to hide PCRE vs RE2
extractor.c: do not include pcre.h any more
extractor.h: remove old prototypes --> re_utils
ioc.h: add SS_IOC_TYPE_EMPTY
json.c: clarify error message for missing booleans
metadata.c: simplify usage of ss_metadata_prepare_syslog
metadata.h: simplify usage of ss_metadata_prepare_syslog