syslog-ng 3.5.5 compatibility

syslog-ng 3.5.5 introduced an incompatible change in value-pairs, in
order to allow time-zone settings to propagate to value-pairs. This
patch ups the syslog-ng dependency, and updates all relevant modules.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
scl: Fixed the elasticsearch SCL plugin

We can't break $(format-json) into multiple lines, as that produces a
syntax error. Changed the elasticsearch SCL plugin to have it on one
single line.

Reported-by: Peter Czanik <czanik@balabit.hu>
Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Merge pull request #74 from algernon/h/elastic-scl-fix

scl: Fixed the elasticsearch SCL plugin
Merge pull request #73 from algernon/f/syslog-ng-3.5.5

syslog-ng 3.5.5 compatibility
Preparations for syslog-ng-incubator 0.3.3

Bumped the version in configure.ac, and updates the NEWS with the bug
fix logs.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>