znapzend: update to 0.19.1

Changes:

0.19.1:
fixed the tar file to include ALL the files in the init directory

0.19.0:
Release 0.19.0 adds a bunch of documentation updates as well as:
a 10 minute timeout for mbuffer since many systems are way slower than we expected
a larger blocksize for mbuffer
a system v init script
an rpm spec file
do not start if no backups/snaps are configured
customized upstart and systemd startup files

(wiedi)