Add command-line options to improve automation
Add command-line options to improve automation

Added command-line options in order to disable interactive prompts.
This lets the utility be more easily run by configuration
management tools (in this case, Salt) before ElastAlert is first
run without the use of e.g., expect or pexpect.

rprabhat/elastalert,iamrudra/elastalert,kkoppel/elastalert,rounds/elastalert,jetyang2005/elastalert,gbenoit79/elastalert,dvopsway/elastalert,saltukalakus/elastalert,lytics/elastalert,thomdixon/elastalert,Yelp/elastalert,jetyang2005/elastalert,saltukalakus/elastalert,jetyang2005/elastalert,megancarney/elastalert,AlphaStaxLLC/elastalert,amoennin/elastalert,brianparry/elastalert,ltagliamonte/elastalert,mash0304/elastalert