Add logger tool from Finit project to complement sysklogd

This patch introduces a relicensed logit from the Finit[1] project.  It
has been rebranded as logger to complement the features implemented in
the sysklogd project.

Note, logger conflicts with the tool of the same name from util-linux.

[1]: https://github.com/troglobit/finit

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/.gitignore

@@ -0,0 +1 @@
+logger