[JENKINS-43813] Remove dependency to script-security-plugin.
[JENKINS-43813] Remove dependency to script-security-plugin.

Removed script sandbox for Groovy parsers. Now parsers can be defined
in the global configuration by an administrator with RUN_SCRIPTS
permission. The script itself is not checked by the sandbox anymore.

jenkinsci/checkstyle-plugin,recena/checkstyle-plugin,jenkinsci/checkstyle-plugin,jenkinsci/checkstyle-plugin,recena/checkstyle-plugin,recena/checkstyle-plugin