Tuned puppet-logstash according to our platform requirements.
  - Change the default user/group to logstash/service;
  - Add logstash.conf template file
  - Add lgs-pattern file

Signed-off-by: Leon Cui <leon.cui@outlook.com>
Fixed the logstash init script issue by replacing
with the new logstash init script

Signed-off-by: Leon Cui <leon.cui@outlook.com>
Fixed the issue in logstash init script

Signed-off-by: Leon Cui <leon.cui@outlook.com>
Merge pull request #1 from logstream/develop

Tuned puppet-logstash according to our platform requirements.