https://issues.apache.org/jira/browse/TINKERPOP-2174

- use least privileged user:group -  `gremlin`
- use the dynamic tag to get the latest image: `openjdk:8-jre-alpine`

also snuck in some non-security ones:
- replaced deprecated `MAINTAINER` with `LABEL maintainer...`
- use  `--no-cache` instead of `rm -rf /var/cache/apk/*`

Tested gremlin-console and gremlin-server images.

VOTE +1


[ Full content available at: https://github.com/apache/tinkerpop/pull/1080 ]
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