Low: build: update .gitignore and make maintainer-clean target

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Low: build: cleanup autogen warning to not overrride LDFLAGS

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Low: doc: Add better documentation on thread-safe logging
Merge pull request #126 from davidvossel/17.1.fixes

build cleanup and thread-safe logging documentation