Enable usage of ssl certificates for ElasticSearch connection

[daskanu]

I am using ElastalertServer in an OpenShift environment and therefore I had to do the following modification in order to get ElastalertServer connected with ElasticSearch.

[nsano-rururu]

After merging into johnsusek / elastalert-server, there is a bug and the following fixes.

src/common/elasticsearch_client.js

before

ssl_body.rejectUnauthorized = true;

after

ssl_body.rejectUnauthorized = false;