MT#9407 Add script elasticsearch-remove-old-indices

Change-Id: I8674956df153399022abd6b61fc9bd5d071307e6
MT#9407 Add defaults support to elasticsearch-remove-old-indices

We should abort the script in case of missed NGCP config,
otherwise we can accidentally remove customer's index 'logstash'

Also redirects all errors to STDERR.

Change-Id: I45287440f03e5e5aa7310b149b2a6bfe70307c52