Bump jetty-server from 9.2.21.v20170120 to 9.3.27.v20190418#87

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dependabot/maven/org.eclipse.jetty-jetty-server-9.3.27.v20190418metamx/java-util:dependabot/maven/org.eclipse.jetty-jetty-server-9.3.27.v20190418Copy head branch name to clipboard