Add checking by dependency-check-maven

[php-coder]

• https://techblog.bozho.net/owasp-dependency-check-maven-plugin-must/
• https://jeremylong.github.io/DependencyCheck/dependency-check-maven/
• https://jeremylong.github.io/DependencyCheck/general/suppression.html

It can be running by executing mvn org.owasp:dependency-check-maven:check command.
The report will be here: target/dependency-check-report.html

Probably, we shouldn't run it with all other checks but separately as a cron job.

[php-coder]

At this moment it complains on:

• jetty-http-9.2.18.v20160721.jar (1 CVE)
• mysql-connector-java-5.1.41.jar (446 CVEs)

[php-coder]

In the light of #1669 we don't need this.